What is the difference between cPanel and Web Host Manager (WHM)?
Web Host Manager or WHM, provides administrative control of your cPanel Dedicated Server, your cPanel Virtual Dedicated Server or your cPanel Reseller Hosting account. Your use of WHM to create individual accounts, add domains to your server, manage hosting features and perform basic system and control panel maintenance.
cPanel is designed for managing individual hosting accounts and particular domains, on your server or reseller account. End users can control everything from adding/removing email accounts to administering MySQL and PostgreSQL databases.
For more information about cPanel and WHM, please visit the official cPanel web site at http://www.cpanel.net.