cPanel

cPanel is a Linux based web hosting control panel that provides a graphical interface and automation tools designed to simplify the process of hosting a web site. It provides capabilities for administrators, resellers, and end-user website owners to control the various aspects of website and server administration through a standard web browser. http://cPanel.com

Off Topic Warning:

The majority of questions regarding the cPanel control panel are likely to be more appropriate for the Pro Webmasters Stack Exchange and will be closed here as they are not considered on-topic for ServerFault:

Questions involving web hosting control panels are off-topic at Server Fault because they customize their systems such that normal administration tools and methods no longer apply, and thus require support from the vendor or the web hosting industry. See Where can I ask questions about web hosting control panels?

There have been several discussions on meta.serverfault.com regarding this policy.