WebHost Manager (WHM) is an administrative control tool that allows the user to manage the back-end of multiple cPanel accounts. WHM allows you to manage individual accounts as well as set server-side limits. It is a powerful program that allows administrative access to the back end of cPanel. WHM is used by hosting providers to manage their customers accounts and is also a reseller control panel. WHM makes reselling hosting possible and enables full control over multi-site management. WHM provides administrative control over your dedicated server or VPS. The top tier and highest-level user is the root user, who has full access to the server and can modify global server settings as well as customize settings for users with more limited privileges.