What are User Manager in cPanel

The User Manager interface allows you to manage your Subaccounts. Subaccounts use the same login and password information for email, FTP, and Web Disk services. The system synchronizes the password of each of the Subaccount’s allowed services.
This interface also allows you to merge email, FTP, and Web Disk accounts into a single Subaccount or link existing service accounts to Subaccounts.