Web Hosting Glossary

If you've ever read a hosting article or a control panel setting and hit a wall of acronyms you had to Google, you're not alone. Hosting and server terminology can feel like its own language, especially when you're troubleshooting something at 11 p.m. and just want your site back online.

We put this glossary together to cut through that. It covers the terms you're most likely to run into while managing a website, a VPS, or a mail server — listed alphabetically so you can search or jump straight to the letter you need instead of hunting through the whole page. Keep it bookmarked; we'll add to it as new terms come up.

Tip

Looking for one specific term? Press Ctrl+F on Windows (Cmd+F on Mac) to search this page directly, or jump straight to a letter below.

A

18 terms

A Record

Address RecordThe DNS record that points a domain or subdomain straight at an IPv4 address. This is usually the first thing you edit when moving hosts.

AAAA Record

IPv6 Address RecordDoes the same job as an A record, just for IPv6 addresses instead of IPv4.

ACL

Access Control ListA set of rules defining exactly who — or which IP addresses — can access a specific resource, and what they're allowed to do once they're in.

Addon Domain

Additional Hosted DomainA separate, fully functional domain hosted within the same cPanel account as your primary domain, without needing a new hosting plan.

AEO (Answer Engine Optimization)

Optimizing for AI Answer EnginesShaping content so it's more likely to be found and cited by AI-driven answer engines and chatbots, not just traditional search engines.

Agentic AI

Task-Executing AIAI that doesn't just reply with text — it takes multi-step actions on your behalf, like installing software, calling other tools, or completing a purchase, instead of stopping at a single response.

Artificial IntelligenceThe broad umbrella term for software that performs tasks — writing, recognizing images, holding a conversation — that would normally require human judgment.

AI Agent

Autonomous Task-Executing SystemA system that uses an AI model to plan and carry out multi-step tasks on its own, often by calling other tools or services along the way.

AI Credits

Prepaid AI Model BalanceA prepaid credit balance for VPS and VDS customers that covers usage across multiple AI providers — including Anthropic, Google, and OpenAI — through a single API key and billing relationship, instead of managing a separate account and bill with each provider.

AI Website Builder

Automated Site GeneratorA tool that generates a starting layout, images, and copy for a website based on a short description you give it, cutting out a lot of the blank-page setup work.

Algorithm

Step-by-Step Problem-Solving MethodA defined set of steps a system follows to solve a problem or complete a task — the instructions a model runs on, not the model itself.

Alignment

Matching AI Behavior to IntentThe effort to make sure an AI system's behavior actually reflects what the people using it want and expect, rather than technically correct but unhelpful or unsafe output.

Anycast

Routing TechniqueLets the same IP address be announced from multiple locations at once, so traffic automatically routes to whichever is closest or healthiest.

API

Application Programming InterfaceA defined set of rules that lets two pieces of software talk to each other, without either one needing to know how the other works internally.

API Key

Access CredentialA unique code that authenticates your requests to an AI (or other) service, tracks your usage, and keeps your account separate from everyone else's.

Attention Mechanism

Model Focus TechniqueA technique that lets a model weigh which parts of the input matter most when generating each part of its response, instead of treating every word equally.

AUP

Acceptable Use PolicyThe rules governing what you can and can't run on a hosting account — things like resource limits, prohibited content, and acceptable email sending practices.

Auto-Renewal

Automatic BillingAutomatically charges your saved payment method and renews a domain or hosting plan before it expires, so you don't lose it to a missed deadline.

B

10 terms

Backlink

Inbound LinkA link from another website pointing to yours. Search engines generally treat backlinks — especially from reputable sites — as a vote of confidence in your content.

Backup / Snapshot

Data Recovery PointA backup copies your files and databases; a snapshot captures the entire server state at a point in time so you can roll back if something breaks.

Bandwidth

Data Transfer CapacityHow much data can move to and from your server in a given period — usually the thing that gets throttled first if a site suddenly goes viral.

Bare Metal Server

Non-Virtualized HardwareEssentially another name for a dedicated server, used to emphasize that there's no virtualization layer at all sitting between you and the physical hardware.

Benchmark

Standardized Model TestA fixed test or dataset used to measure and compare how different AI models perform on a specific kind of task.

Bias

Skewed Model OutputA consistent skew in what a model produces, usually traced back to patterns or imbalances in the data it was trained on.

Blocklist / Blacklist

Reputation DatabaseA list of IP addresses or domains flagged as spam sources. Getting listed on one can quietly tank your email deliverability until you're removed.

BMAD

AI Workflow LayerA structured workflow method that installs on top of an AI coding tool you already have, like Claude Code, rather than hosting a model of its own. Whether it ends up using a local or cloud model depends entirely on whichever tool it's connected to.

Bounce (Hard / Soft)

Delivery FailureA hard bounce means the email failed permanently, usually a bad address; a soft bounce means it failed temporarily — a full inbox, a server hiccup — and may still go through on retry.

Brute Force Attack

Credential Guessing AttackAn attacker (or a bot) rapidly tries huge numbers of password combinations against a login form, hoping one eventually works.

C

26 terms

CAA Record

Certification Authority AuthorizationSpecifies which certificate authorities are allowed to issue SSL certificates for your domain, blocking anyone else from issuing one without your knowledge.

Cache

Temporary Data StorageA stored copy of something (a page, a database query, an image) kept ready to serve instantly, so the server doesn't have to rebuild it from scratch on every single visit.

Cache Purge

Cache Clearing ActionManually clears cached versions of your pages so visitors immediately see the latest content instead of an outdated cached copy.

CAPTCHA

Human Verification ChallengeThose "prove you're not a robot" checks on forms, designed to block automated bots without slowing down real users too much.

Catch-all Email

Fallback AddressA mailbox that receives anything sent to your domain with no matching address, so nothing addressed to a typo'd or old inbox gets lost.

CDN

Content Delivery NetworkA network of servers spread across different locations that cache your site's content closer to visitors, cutting load times. Many hosts bundle a free tier, most commonly through Cloudflare.

Chatbot

Conversational InterfaceA program that simulates a text (or voice) conversation, ranging from simple scripted responses to full AI-driven assistants that can handle open-ended questions.

Child Theme

Theme Customization LayerA theme that inherits everything from a "parent" theme, letting you customize the design safely without your changes being wiped out the next time the parent theme updates.

Chroot Jail

Restricted Filesystem EnvironmentConfines a process (or user) to a specific directory tree, so it can't see or touch files outside that sandbox even if compromised.

Chunking

Document Splitting for RetrievalBreaking a long document into smaller pieces so each piece can be indexed and retrieved individually — a common prep step before feeding content into a search or RAG system.

CI / CD

Continuous Integration / Continuous DeploymentThe practice of automatically testing and shipping code changes, instead of manually building and uploading every update by hand.

Claude Code

AI Coding AssistantAnthropic's command-line coding assistant for writing, debugging, and reviewing code. It always calls out to Anthropic's cloud API to run, even when installed on your own server, since Anthropic hasn't released the underlying model's weights.

Cloud Hosting

Distributed InfrastructureRather than running on a single physical server, your site draws resources from a connected pool of machines, so it can typically absorb traffic spikes or hardware hiccups more gracefully.

CloudLinux

Shared Hosting OSA Linux distribution built specifically for shared hosting environments, designed to isolate accounts from one another so a problem on one site doesn't spill over onto its neighbors.

CMS

Content Management SystemSoftware like WordPress or Joomla that lets you build and update a website without writing raw HTML for every page.

CNAME

Canonical Name RecordPoints one domain or subdomain to another domain name rather than to an IP address directly — common for things like www pointing to the root domain.

Colocation Hosting

Self-Owned Hardware, Rented SpaceYou own the physical server, but it lives in the provider's data center, using their power, cooling, and network connection instead of yours.

Console

Direct Access TerminalA browser-based terminal built into your hosting dashboard for VPS and VDS servers, giving you a way in even if SSH is unreachable — say, after a firewall misconfiguration locks out normal remote access.

Content Sanitization

Source Content CleanupCleaning up and reformatting raw source content — stripping formatting artifacts, jargon, or unsafe text — so it's usable by an AI system or a voice assistant.

Context Window

AI Memory LimitThe amount of text an AI model can "see" and reference at once during a conversation, measured in tokens. Once a conversation grows past that limit, the model starts losing track of the earliest parts of it.

Conversion Rate

Goal Completion PercentageThe share of visitors who complete whatever action you actually want — a purchase, a signup, a form submission — out of everyone who showed up.

Core Web Vitals

Page Experience MetricsA specific set of speed and stability measurements Google uses to judge how a page feels to use, and one of the factors that can influence search rankings.

cPanel / WHM

Control Panel / Web Host ManagercPanel is the dashboard most hosting customers use to manage domains, email, and files. WHM is the admin-level panel hosts and resellers use to manage cPanel accounts underneath it.

Cron / CRON

Scheduled Task DaemonRuns commands or scripts automatically on a schedule you set. Despite what a lot of people assume, it's not really an acronym — the name most likely traces back to the Greek word for time, "chronos."

CSR

Certificate Signing RequestA block of encoded text you generate on your server and submit to a certificate authority to request an SSL certificate.

cURL

Client URLA command-line tool for sending HTTP requests directly from a terminal — extremely common in setup guides and API testing.

D

19 terms

Data Center

Physical Server FacilityThe building where your server's actual hardware lives, with staff, power redundancy, cooling, and network connectivity managed around the clock rather than left to chance.

Data Center Tier (I–IV)

Reliability ClassificationA rating system for how redundant a data center's power and cooling infrastructure is. Tier IV facilities can lose a component without any downtime; Tier I can't.

Dataset

Training Data CollectionA structured collection of data — text, images, or other content — used to train, fine-tune, or evaluate an AI model.

DCV

Domain Control ValidationThe check a certificate authority runs to confirm you actually control a domain before issuing an SSL certificate for it.

DDoS

Distributed Denial of ServiceAn attack that floods a server with traffic from many sources at once, trying to overwhelm it so real visitors can't get through.

Dedicated Server

Single-Tenant HardwareAn entire physical machine reserved for one customer. Maximum performance and control, but you're also responsible for more of the upkeep.

Deep Learning

Multi-Layered Neural Network ApproachA branch of machine learning that uses neural networks with many layers to model complex patterns, and is what powers most modern image, audio, and text AI.

DeepSeek

Open-Source AI ModelAn open-source AI model family available as a one-click app on VPS and VDS plans. It runs through Ollama and is CPU-only, so it doesn't need a GPU — the smaller distilled versions run reasonably well on modest server specs.

Dify

AI App Builder PlatformA visual, low-code platform for building AI-powered applications and workflows without writing a full backend from scratch.

Disk Quota

Storage Allocation LimitThe maximum amount of storage your hosting plan allows for files, databases, and email combined.

DKIM

DomainKeys Identified MailAttaches a cryptographic signature to outgoing email so the receiving server can confirm the message wasn't altered in transit.

DMARC

Domain-based Message Authentication, Reporting & ConformanceBuilds on SPF and DKIM by telling receiving servers what to do with mail that fails those checks — and can send you reports on spoofing attempts.

DNS

Domain Name SystemThe internet's phonebook — it translates a domain name like yoursite.com into the IP address computers actually use to find it.

DNS Propagation

Record Update DelayThe window of time it takes for a DNS change to update across every resolver on the internet — usually minutes, but it can stretch to 24–48 hours.

DNS Zone Editor

Record Management ToolThe interface in your control panel for adding, editing, or removing individual DNS records like A, CNAME, and MX, without needing to touch a raw zone file.

Docker

Containerization PlatformPackages an app with everything it needs to run into a single portable container, so it behaves the same on your laptop as it does in production.

Domain Forwarding

URL RedirectSends visitors from one domain to a different URL entirely — unlike a parked domain, which shows the same content while keeping the original address in the browser bar.

Domain Lock / Transfer Lock

Transfer ProtectionA setting that blocks a domain from being moved to another registrar without your say-so, mainly there to stop unauthorized transfers.

Domain Registrar

Domain Sales ProviderThe accredited company you actually buy and renew a domain name through, separate from whoever hosts the site living on that domain.

E

7 terms

.env

Environment Variables FileKeeps sensitive values like API keys and database passwords out of your codebase, so they're not sitting in version control for anyone to find.

Email Alias

Forwarding AddressAn extra email address that forwards to an existing mailbox, letting you use several addresses — like sales@ and info@ — without managing a separate inbox for each one.

Email Marketing

Direct Audience OutreachSending newsletters, promotions, or updates straight to a list of subscribers, generally through dedicated software rather than a regular inbox.

Embedding

Vector RepresentationA numeric representation of text (or images) that captures meaning, letting a system compare how similar two pieces of content are mathematically.

EPP Code

Authorization / Transfer CodeA unique code your current registrar gives you to prove ownership when transferring a domain to a new registrar.

ERR_CONNECTION_TIMED_OUT

Browser Connection ErrorThe browser couldn't establish a connection to the server at all — this points to a network or DNS issue rather than anything wrong with the website's code itself.

Explainability / Interpretability

Model Decision TransparencyHow well a person can actually understand why a model produced the output it did, rather than treating its reasoning as a total black box.

F

9 terms

Fail2ban

Intrusion Prevention ToolWatches your server logs for repeated failed login attempts and automatically bans the offending IP addresses for a set period.

File Manager

Browser-Based File ToolA cPanel feature for uploading, editing, and organizing your site's files right in the browser — no FTP client required.

Fine-Tuning

Model RetrainingFurther training an existing AI model on your own data so its behavior and knowledge shift to match, rather than relying only on how it was originally trained.

Firewall

Traffic Filtering SystemThe broader category UFW and WAF both belong to — software or hardware that decides which network traffic is allowed to reach a server and which gets blocked.

Foundation Model

General-Purpose Base ModelA large model trained on broad, general data that can then be adapted to many different tasks, rather than being built to do just one thing.

FQDN

Fully Qualified Domain NameA domain name written out in full, including the host and top-level domain — e.g., server1.example.com rather than just "server1."

Free Domain

Bundled RegistrationA domain name included at no extra cost with certain hosting plans, typically for the first year, after which it renews at the standard registration price.

FTP

File Transfer ProtocolAn older method for moving files to and from a server. Still around, but it sends data unencrypted, so it's fading out in favor of SFTP.

FTP Client

Local File Transfer AppThe program you install on your own computer to actually connect to your server over FTP or SFTP. FileZilla is the most common free option, with Cyberduck and WinSCP as popular alternatives.

G

10 terms

Gap Analysis

Content Coverage ReviewA systematic comparison between the content that already exists and what's actually needed, used to spot missing articles or coverage holes in a knowledge base.

GatorClaw

No-Code AI Agent PlatformBluehost's simplified, guided AI agent app, built on the same underlying ecosystem as OpenClaw. Per Bluehost's own documentation, it's scoped to third-party cloud AI providers like OpenAI, Anthropic, and Google rather than local models.

Generative AI

Content-Creating AIAI systems that produce new content — text, images, code — rather than just analyzing or classifying existing content.

Git

Version Control SystemTracks changes to code over time, letting multiple people work on the same project without overwriting each other's changes.

GPU

Graphics Processing UnitA chip originally built for rendering graphics that turns out to be extremely good at the math behind AI, which is why "GPU hosting" has become its own category for running AI workloads.

Grace Period

Renewal BufferA short window after a hosting or domain plan expires where service keeps running before it's actually suspended or the domain is released for anyone else to register.

Greylisting

Anti-Spam TechniqueTemporarily rejects mail from unfamiliar senders; legitimate servers retry automatically, while a lot of spam sources never bother.

Ground Truth

Verified Reference DataConfirmed, accurate data used as the reference point for checking whether a model's output is actually correct.

Guardrails

Output Safety ConstraintsRules or filters built around a model to keep its output within safe, on-topic, or policy-compliant bounds.

Gzip / Brotli Compression

File CompressionShrinks files before sending them to a visitor's browser, which then unpacks them on arrival — cutting load times without changing what's actually on the page.

H

7 terms

.htaccess

Apache Configuration FileA per-directory config file used for redirects, custom error pages, and access rules — one of the most commonly edited (and broken) files in shared hosting.

Hallucination

Fabricated AI OutputWhen an AI model confidently states something false or made-up as though it were fact, usually because it's predicting plausible-sounding text rather than looking anything up.

Hermes Agent

Open-Source AI Agent FrameworkAn open-source AI agent framework built around a self-improvement learning loop, available as a one-click app for Self-Managed VPS and VDS.

HSTS

HTTP Strict Transport SecurityA setting that tells browsers to only ever connect to your site over HTTPS, refusing plain HTTP even if someone types it in directly.

HTTP

HyperText Transfer ProtocolThe underlying protocol browsers and servers use to request and send web pages.

HTTP/2 / HTTP/3

Modern HTTP VersionsNewer revisions of the HTTP protocol that load multiple resources over a single connection more efficiently, cutting page load times compared to HTTP/1.1.

HTTPS

HTTP SecureHTTP wrapped in SSL/TLS encryption, so data moving between browser and server can't be read or tampered with in transit.

I

7 terms

IDN

Internationalized Domain NameA domain name that includes non-ASCII characters, like accented letters or non-Latin scripts, converted behind the scenes into a format browsers can read.

IMAP

Internet Message Access ProtocolKeeps email synced on the server so you can check the same inbox from your phone, laptop, and webmail without messages going missing anywhere.

Inference

Using a Trained ModelThe step where a trained model is actually used to generate a prediction or response for new input, as opposed to the training step that came before it.

Inode

Filesystem Object CountEvery file, folder, and email on your account counts as one inode. Hosting plans often cap the total, separately from disk space.

IOPS

Input/Output Operations Per SecondA measure of how many read/write operations a drive can handle per second — often a better indicator of real-world performance than raw storage size.

IPv4

Internet Protocol version 4The older, still widely used addressing scheme, written as four number groups like 192.0.2.1. We're gradually running out of these.

IPv6

Internet Protocol version 6The newer addressing scheme built to solve IPv4's shortage problem, using a much longer format like 2001:db8::1.

J

2 terms

JSON

JavaScript Object NotationA lightweight, easy-to-read data format that's become the default for APIs and configuration files across most modern software.

JSON Schema

Output Structure SpecificationA formal definition of the fields and structure an AI-generated JSON response is expected to follow, so downstream systems can reliably parse it.

K

3 terms

Keyword

Search Term TargetA word or phrase you shape a page's content around, based on what people are actually typing into search engines when looking for something like it.

Knowledge Base (KB)

Structured Reference ContentA structured collection of articles and guides — like this one — built to help customers or support agents find answers quickly.

KVM

Kernel-based Virtual MachineA virtualization module built into the Linux kernel that lets one physical server run several independent virtual machines with hardware-level isolation.

L

10 terms

LAMP

Linux, Apache, MySQL, PHPThe classic open-source stack behind a huge share of the web, including WordPress in its default form.

Langflow

Visual AI Workflow BuilderA drag-and-drop tool for building and connecting AI workflows visually, without writing the underlying code by hand.

LEMP

Linux, Nginx, MySQL/MariaDB, PHP/PythonBasically LAMP's sibling — same idea, but Nginx handles the web serving instead of Apache. ("Nginx" is pronounced "engine-x," which is where the E comes from.)

Let's Encrypt

Free Certificate AuthorityA nonprofit CA that issues free, short-lived SSL/TLS certificates and renews them automatically — the reason most small sites run HTTPS by default now.

LLM

Large Language ModelA machine learning model trained on huge amounts of text so it can generate and understand natural language — the technology behind tools like chatbots and AI writing assistants.

LLM Gateway

Multi-Provider AI Access PointA single endpoint that routes requests out to multiple AI providers — like Anthropic, Google, and OpenAI — behind one API key, so an app or agent can switch between models without reconfiguring a separate connection for each provider.

Load Balancer

Traffic Distribution SystemSpreads incoming requests across multiple servers so no single one gets overwhelmed, and can reroute traffic if a server goes down.

Log File

Activity RecordA running record of events on a server — errors, visits, login attempts — usually the first place to look when something's misbehaving.

LVE

Lightweight Virtual EnvironmentA per-account container that caps how much CPU and memory a single shared hosting account can consume, so one account having a bad day doesn't drag down everyone else on the server.

LXC

Linux ContainersA lighter form of virtualization where containers share the host's kernel instead of running their own. Faster to spin up than a full VM, though isolation is less strict.

M

12 terms

Machine Learning

Pattern-Based PredictionA branch of AI where a system improves at a task by learning patterns from data, rather than following rules a person wrote out step by step.

Mailbox Quota

Email Storage LimitThe maximum storage allowed for a single email account before new messages start bouncing.

Malware Scanner

Security Monitoring ToolSoftware that checks your files for known malicious code patterns and flags or quarantines anything suspicious it finds.

Managed WordPress Hosting

WordPress-Optimized HostingA hosting environment tuned specifically for WordPress, usually bundling caching, automatic core updates, and staging tools so you're not configuring all of that by hand.

MCP

Model Context ProtocolA standard that lets AI agents connect to and use external tools and services — like purchasing or managing hosting — through a defined set of actions, instead of needing a custom integration built for every tool.

Meta Description

Search Result SnippetThe short summary text that shows up under a page's title in search results, written to encourage a click rather than to be read by the page's actual visitors.

Minification

Code Size ReductionStrips unnecessary spacing and comments out of CSS and JavaScript files to make them smaller and faster to load, without changing what the code actually does.

Model

Trained Prediction SystemThe result of training — a set of learned parameters that can make predictions or generate content when given new input.

ModSecurity

Open-Source WAF EngineOne of the most widely used engines powering web application firewalls on Apache and Nginx servers, often running quietly in the background of shared hosting.

Multi-Agent System

Collaborating AI AgentsA setup where several AI agents work together on a task, each typically handling a different piece of the work.

Mail Exchange RecordThe DNS record that tells the internet which mail server is responsible for handling email for your domain.

MySQL / MariaDB

Database SoftwareThe database engines behind most hosted websites, including WordPress by default. MariaDB started as a community fork of MySQL and is largely a drop-in replacement for it.

N

8 terms

n8n

Workflow Automation PlatformAn open-source automation tool that connects apps and services together into automated workflows, similar in spirit to Zapier but self-hostable.

NanoClaw

AI Agent Built on ClaudeAn AI agent app built on the Claude Agent SDK, installable on Self-Managed VPS and VDS. It can hand off smaller subtasks to a local model, but its main orchestration still relies on a cloud AI provider.

NAT

Network Address TranslationLets devices on a private network share a single public IP address to reach the internet.

Neural Network

Brain-Inspired Model StructureA model structure loosely modeled on the brain, made of layered nodes that transform input data step by step into an output.

Nginx / Apache

Web Server SoftwareThe two most common programs for actually serving your website's files and handling incoming HTTP requests.

NLP

Natural Language ProcessingThe broader field of AI focused on getting computers to understand, interpret, and generate human language.

NS / Nameserver

Name Server RecordTells the internet which servers are authoritative for your domain's DNS — essentially, whose DNS records to trust and read.

NVMe

Non-Volatile Memory ExpressA high-speed protocol for SSDs that connects directly to a system's high-bandwidth bus, making it noticeably faster than older SSD interfaces.

O

10 terms

OAuth

Open AuthorizationThe standard behind "Log in with Google" style buttons, letting an app verify your identity without ever handling your actual password.

Object Caching

Database Query CachingStores the results of expensive database queries in memory, often using Redis or Memcached, so repeat requests skip hitting the database again — especially useful for dynamic sites like WordPress.

Ollama

Local AI Model RunnerA tool for downloading and running open-source AI models directly on your own server, so requests never have to leave your machine.

One-Click Installer

App Installation ToolA control panel feature (Softaculous is the most common one) that installs WordPress and dozens of other apps in a couple of clicks, instead of manually uploading files and setting up a database yourself.

ONNX

Open Neural Network ExchangeAn open file format for machine learning models, designed so a model trained in one framework can run in another without being rebuilt from scratch.

OPcache

PHP Opcode CacheStores precompiled PHP code in memory so the server doesn't have to recompile the same scripts on every single page load.

Open WebUI

AI Chat InterfaceA self-hosted, browser-based chat interface for interacting with locally run AI models, often paired with Ollama.

OpenClaw

Open-Source AI Agent FrameworkA self-hosted, open-source framework for running a personal AI agent, with more technical setup and flexibility than its simplified sibling, GatorClaw.

Orchestration

Multi-Step Workflow CoordinationCoordinating multiple models, tools, or steps so they work together to complete a more complex task than any one of them could handle alone.

Overselling

Shared Resource PracticeWhen a host sells more storage/bandwidth than physically exists on a server, betting that not everyone will use their full allotment at once. Common in budget shared hosting.

P

15 terms

PaaS / IaaS

Platform / Infrastructure as a ServiceIaaS hands you raw compute and storage to build on; PaaS goes a step further and gives you a managed environment where you just deploy code.

Paperclip

AI Coding ToolA one-click AI coding app available for Self-Managed VPS and VDS — not to be confused with an older, unrelated Ruby gem of the same name.

Parameters

Model's Learned ValuesThe internal numeric values a model adjusts during training — often used as shorthand for how large or capable a model is, as in "70 billion parameters."

Parked Domain

Domain AliasAn extra domain pointed at your existing site so it loads the same content — often used to hold onto alternate spellings or TLDs.

PEM

Privacy-Enhanced MailA common file format (.pem) for storing SSL certificates and private keys as base64-encoded text, despite the "mail" in the name having nothing to do with email anymore.

Permalink

Post/Page URL StructureThe actual URL format WordPress uses for your posts and pages, which you can customize for readability or SEO instead of leaving it as the default query-string style.

PHP-FPM

PHP FastCGI Process ManagerManages how PHP handles multiple requests at once, generally making PHP-based sites (like WordPress) noticeably faster than older handling methods.

phpMyAdmin

Database Management ToolA web-based interface for viewing and editing your MySQL/MariaDB databases directly, useful for quick fixes without writing raw SQL commands.

Ping / Latency

Response Time MeasurementPing tests how long a round trip to a server takes; latency is the delay itself. Lower is better for anything time-sensitive.

Plugin

Add-On FunctionalityA small piece of software you install into WordPress to add a specific feature — contact forms, SEO tools, caching, and so on — without editing the core code.

POP3

Post Office Protocol 3Downloads email from the server to a single device and typically removes it from the server afterward.

Port

Network Communication EndpointA numbered channel on a server that specific services listen on — port 80 for HTTP, 443 for HTTPS, 22 for SSH, and so on.

Prompt

User InstructionThe text you type in to tell an AI model what you want it to do — the quality and detail of the prompt usually has a big effect on the quality of the answer.

Prompt Engineering

Crafting Better AI InstructionsThe practice of wording and structuring your input to a model so it produces more accurate, useful, or reliable output.

PTR

Pointer RecordA DNS record used for reverse lookups — going from an IP address back to a domain name, which matters a lot for email deliverability.

Q

1 term

Quantization

Model Size ReductionA technique that shrinks an AI model's size by reducing the precision of its internal numbers, letting it run on smaller, cheaper hardware at a small cost to accuracy.

R

12 terms

RAG

Retrieval-Augmented GenerationAn approach where an AI system looks up relevant information first, then uses that as grounding to write its answer, instead of relying only on what it memorized during training.

RAID

Redundant Array of Independent DisksA way of combining multiple physical drives so data survives a single drive failure, gets faster read/write speeds, or both, depending on the RAID level in use.

RAID 0 / 1 / 5 / 10

RAID LevelsDifferent flavors of RAID. RAID 0 is pure speed with zero redundancy, RAID 1 mirrors drives for safety, and RAID 5/10 blend redundancy with performance.

RAM

Random Access MemoryFast, short-term memory a server uses to hold active processes and data. Unlike storage, it's wiped clean on reboot.

RDAP

Registration Data Access ProtocolThe modern, structured-data successor to WHOIS. ICANN has required it for gTLDs since 2019, but plenty of country-code domains still run WHOIS-only, so both are still in active use.

Red Teaming

Adversarial Model TestingDeliberately probing a model with tricky or adversarial input to find weaknesses or unsafe behavior before it ever reaches customers.

Reseller Hosting

Wholesale Hosting ModelLets you buy server resources in bulk and resell smaller hosting packages to your own clients, usually through white-labeled cPanel accounts.

REST

Representational State TransferA common architectural style for APIs that uses standard HTTP methods like GET and POST to interact with resources.

Reverse Proxy

Traffic RouterSits in front of one or more servers, routing requests, balancing load, caching responses, and shielding the backend from direct exposure.

RLHF

Reinforcement Learning from Human FeedbackA training method that uses human preferences to steer a model toward more helpful and appropriate responses, rather than relying on raw data alone.

robots.txt

Crawler Instructions FileA plain text file that tells search engine bots which parts of your site they're allowed, or not allowed, to crawl.

Root Access

Full Administrative ControlUnrestricted permission to modify anything on a server. Powerful, but a mistake at this level can take the whole box down — handle with care.

S

31 terms

SaaS

Software as a ServiceAn application that runs on someone else's servers and is accessed through a browser or API — think webmail or a hosted CRM. There's no server for you to patch or maintain.

SAN Certificate

Subject Alternative Name / Multi-Domain CertificateAn SSL certificate that covers several entirely different domains under one certificate, rather than just subdomains of a single root domain.

SCP

Secure Copy ProtocolCopies files between machines over an encrypted SSH connection — simple, but has largely been overtaken by SFTP for regular use.

Semantic Search

Meaning-Based SearchSearch that matches based on meaning and intent rather than exact keywords, typically powered by embeddings.

SEO

Search Engine OptimizationThe practice of shaping a site's content, structure, and speed so it ranks higher in search results — everything from page titles to load times can factor in.

SFTP

SSH File Transfer ProtocolFile transfer that rides over an encrypted SSH connection — essentially FTP's more secure replacement.

Shared Hosting

Multi-Tenant HostingThe most common starting point for a new website — many accounts live on one server and split its CPU, RAM, and storage. It's affordable, though a busy "neighbor" site can occasionally slow things down for everyone else on the box.

Shortcode

Content Placeholder TagA short bracketed tag, like [gallery], that WordPress swaps out for a more complex piece of content or functionality when the page renders.

Sim

AI Agent Building PlatformA one-click app for building and running AI agents, with higher hardware requirements than most other agent apps in the catalog.

Site Migration

Hosting TransferMoving a website's files, databases, and settings from one host — or one server — to another, ideally without visitors noticing any downtime.

Sitemap.xml

Site Structure FileAn XML file listing your site's pages so search engines can discover and index them more efficiently.

SLA

Service Level AgreementA host's formal commitment around uptime, support response times, or performance — and what they'll do (often an account credit) if they don't hit it.

SMTP

Simple Mail Transfer ProtocolThe protocol used to send email out from a mail server — it's the "sending" half of the email system.

SNI

Server Name IndicationLets a single IP address serve valid SSL certificates for multiple different domains, which is a big part of why shared hosting with HTTPS works at scale.

SOA Record

Start of Authority RecordHolds the administrative details for a domain's DNS zone, including the primary nameserver and how often other servers should check in for updates.

Social Media Integration

Cross-Platform ConnectionTools or plugins that connect a website to its social accounts — share buttons, embedded feeds, or auto-posting new content out to those platforms.

Spam Filter

Unwanted Mail ScreeningScans incoming mail for spam characteristics and routes suspicious messages to a junk folder instead of the main inbox.

SPF

Sender Policy FrameworkA DNS record that lists which mail servers are allowed to send email on behalf of your domain, helping prevent spoofed messages.

SSD / HDD

Solid-State Drive / Hard Disk DriveSSDs use flash memory and have no moving parts, so they're fast and durable. HDDs use spinning magnetic platters — slower, but cheaper per gigabyte.

SSH

Secure ShellThe standard way to log into a remote server securely, whether you're running commands or transferring files.

ssh_config

SSH Client Configuration FileLets you save shortcuts for servers you connect to often, so you're not retyping hostnames, ports, and usernames every time.

SSL / TLS

Secure Sockets Layer / Transport Layer SecurityThe encryption that puts the "S" in HTTPS. TLS is technically the modern successor to SSL, but people still say "SSL certificate" out of habit.

Staging Environment

Pre-Production CopyA private copy of your live site where you can test changes, updates, or new plugins before pushing them to visitors.

Static Content Caching

Page-Level CachingStores a ready-to-serve copy of unchanging elements — images, CSS, full HTML pages — so the server can hand them out instantly instead of regenerating them on every request.

Structured Metadata

Tagged Reference DataMachine-readable tags — categories, keywords, product identifiers — attached to content to make it easier to search and retrieve.

Structured Output

Predictably Formatted AI ResponseA model response shaped to a predictable format, like JSON, so it can be reliably read by another system instead of a person.

Subdomain

Domain SubdivisionA prefix added to your main domain (like blog.yoursite.com) that can point to a different folder or even a different app entirely.

Sudo

Superuser DoLets a regular user run a specific command with root-level permissions, usually after entering their own password.

Supervised Fine-Tuning (SFT)

Labeled-Example Model TrainingFine-tuning a model using labeled example input-and-output pairs, so it learns a specific behavior directly from demonstrations.

Symlink

Symbolic LinkA shortcut file that points to another file or folder elsewhere on the system, keeping both locations in sync without actually duplicating the data.

System Prompt

AI Behavior InstructionsThe instructions that set an AI model's underlying behavior and ground rules before a conversation starts, as opposed to whatever a person types into the chat. It generally takes priority over a regular prompt when the two conflict.

T

14 terms

Taxonomy

Content Classification SystemA structured system for categorizing content or products so it can be tagged, searched, and retrieved consistently.

Temperature

Output Randomness SettingA setting that controls how predictable or varied a model's output is — lower values keep responses more consistent, higher values make them more creative.

Theme

Site Design TemplateControls how a WordPress site looks — layout, colors, fonts — while keeping the underlying content separate, so you can switch designs without losing your posts and pages.

Throughput

System Processing VolumeHow many requests or tokens a system can process in a given period of time — a measure of capacity rather than speed for any one request.

TLD

Top-Level DomainThe suffix at the end of a domain — .com, .org, .net, and so on.

Token

Text Processing UnitThe small chunks (often pieces of words) that an AI model breaks text into to process it — and usually what API pricing is actually billed by.

Tool Use / Function Calling

Model-Initiated ActionsA model's ability to call an external tool, API, or function to look something up or take an action, instead of only generating text.

Traceroute

Network Path DiagnosticMaps every hop a data packet takes to reach its destination — useful for figuring out where a connection is actually slowing down.

Training

Adjusting a Model on DataThe process of feeding data to a model and adjusting its internal values so it gets better at a task over time.

Training Data

Model Learning MaterialThe large collection of text, images, or other examples an AI model learns from before it's released — its knowledge is shaped entirely by what was in that data.

Transformer

Modern LLM ArchitectureThe neural network architecture behind most current LLMs, which uses an attention mechanism to weigh which parts of the input matter most.

TTFB

Time To First ByteHow long it takes the server to send back the very first byte of a response after a request comes in — a common early diagnostic when a site "feels slow."

TTL

Time-To-LiveHow long, in seconds, a DNS record is cached before systems check for an updated version. Lower TTLs mean changes propagate faster.

TXT Record

Text RecordA flexible DNS record type used to store arbitrary text — most commonly for domain ownership verification, and it's what SPF, DKIM, and DMARC entries actually live in behind the scenes.

U

3 terms

UFW

Uncomplicated FirewallA friendlier front end for Linux's firewall rules — handy if you want basic protection without wrestling with iptables directly.

UPS

Uninterruptible Power SupplyA battery backup system that keeps servers running through short power outages and gives generators time to kick in during longer ones.

Uptime

Availability PercentageThe share of time your site is actually reachable. A host advertising "99.9% uptime" is still technically allowing for a little downtime every month — the math works out to under 45 minutes.

V

7 terms

Varnish

HTTP Cache / AcceleratorSits in front of your web server and serves cached copies of pages directly, often skipping the backend entirely for repeat visitors.

vCPU

Virtual Central Processing UnitA virtual representation of a CPU core assigned to a VM. The physical core underneath may be shared across several vCPUs.

VDS

Virtual Dedicated ServerSimilar idea to a VPS, but the hardware resources are locked to you specifically rather than shared with other tenants on the host.

Vector Database

Similarity Search StoreA database built to store embeddings and quickly find the closest matches to a query — the backbone of most RAG systems.

Voice Script / TTS Output

Text Rewritten for SpeechContent rewritten specifically to be read aloud by text-to-speech software, adjusted for pacing and pronunciation rather than for reading on a page.

VPN

Virtual Private NetworkCreates an encrypted tunnel between your device and a remote network, often used to securely reach server admin tools that aren't meant to be exposed publicly.

VPS

Virtual Private ServerA slice of a physical server that acts like its own machine, with a dedicated OS, CPU allocation, RAM, and storage. You get root access without paying for a whole physical box.

W

12 terms

WAF

Web Application FirewallFilters and blocks malicious HTTP traffic — SQL injection attempts, bad bots, and known exploit patterns — before it ever reaches your application.

Webhook

Event-Triggered CallbackAutomatically sends data to another system the moment something happens — like notifying a Slack channel the instant a form is submitted.

Webmail

Browser-Based Email ClientLets you check and send email through a web browser instead of a dedicated app like Outlook — no setup required, just log in.

Website Analytics

Visitor TrackingSoftware that reports on who's visiting a site, where they came from, and what they did once they arrived — the data most marketing decisions end up leaning on.

Website Builder

Drag-and-Drop ToolA visual, no-code way to put a site together, often included with shared hosting plans as a simpler alternative to installing and configuring a full CMS.

White Screen of Death

Blank Page FailureWordPress shorthand for when a site loads to a completely blank white page with no error message, usually caused by a plugin conflict or a PHP memory limit issue.

WHOIS

Domain Lookup ServiceA public lookup you can run to see who registered a domain and when (though privacy protection often hides the personal details now).

Widget

Sidebar/Footer ElementA small, self-contained block of content or functionality — a calendar, a search bar, recent posts — that you drag into predefined areas of a theme like sidebars or footers.

Wildcard SSL

Multi-Subdomain CertificateA single SSL certificate that covers a domain and all of its subdomains at once (like *.yoursite.com), so you're not issuing a separate certificate every time you add a new subdomain.

WordPress Multisite

Multi-Site NetworkA single WordPress installation that runs several separate sites at once, sharing one dashboard, one set of plugins, and one codebase.

WP-CLI

WordPress Command Line InterfaceLets you manage a WordPress site — installing plugins, running updates, managing users — entirely through terminal commands over SSH instead of clicking through the dashboard.

wp-config.php

Core Configuration FileThe file that holds a WordPress site's database connection details and core settings. Editing it carelessly is one of the most common ways to accidentally take a site down.

X

1 term

XML

eXtensible Markup LanguageAn older, more verbose data format than JSON, still widely used for things like sitemaps, RSS feeds, and legacy API integrations.

Y

1 term

YAML / YML

YAML Ain't Markup LanguageA config file format built to be readable by humans, not just machines — widely used for things like CI pipelines and app settings.

#

9 terms

2FA / MFA

Two-Factor / Multi-Factor AuthenticationRequires a second proof of identity beyond your password, usually a code from an app or text message, before letting you log in.

400 Bad Request

Malformed Request ErrorThe server couldn't understand the request as sent, often due to bad syntax somewhere in the URL or the submitted data.

401 Unauthorized

Authentication Required ErrorThe server is asking you to log in — or log in correctly — before it will show you what you asked for.

403 Forbidden

Access Denied ErrorThe server found what was requested but is refusing to show it, often due to file permission settings or a security rule blocking the request.

404 Not Found

Missing Page ErrorThe server understood the request but couldn't find anything at that address — usually a broken link, a deleted page, or a typo in the URL.

500 Internal Server Error

Generic Server FailureA catch-all error meaning something went wrong on the server's end, without specifying what — often traced back to a broken script or a corrupted .htaccess file.

502 Bad Gateway

Upstream Server ErrorOne server acting as a gateway got an invalid response from another server it was relying on — common when a reverse proxy or load balancer can't reach the backend.

503 Service Unavailable

Temporary Outage ErrorThe server is up but temporarily can't handle the request, often due to maintenance or being overloaded with traffic.

504 Gateway Timeout

Upstream Timeout ErrorSimilar to a 502, but here the upstream server simply took too long to respond and the request timed out waiting.

This glossary is here to make hosting and server terms less confusing for you. Whether you're managing a website, using a VPS, or just trying to understand a word your support team mentioned, you'll find clear, simple definitions grouped by topic. From domains and security to email and WordPress, this guide helps you quickly find what you need without jargon getting in the way. Bookmark it and come back anytime you need a quick explanation or want to brush up on tech terms in plain English.

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