VPS & Dedicated Hosting: NginX
NginX is a web server and/or a reverse proxy added on top of Apache, which is capable of handling connections better than apache. This can help handle high traffic to sites. Often this is installed with Varnish, as well.
Note that Bluehost does not provide technical support for the installation or usage of NginX.
You will need to make sure that you have Sudo Access enabled. If you have not enabled Sudo access please see Enabling Sudo Access to learn how to do so. You will also need to know your Apache version. That can be found through SSH by typing
httpd -v and pressing enter. For more information about NginX, please visit this article VPS & Dedicated Hosting: Third Party Applications.