Server Control Panel, or cPanel, is a fully-featured web-based control panel that allows you to manage your domain through a web interface.

The idea is to transfer as much of the control and responsibility of managing your web site to YOU.
You have the ability to manage all aspects of email, files, backup, FTP, CGI scripts, and web site statistics.

More information from the Cpanel site - Click here
PDF Cpanel Manual - Click here