Plesk license is a software license that enables web hosting providers and server administrators to use Plesk, a popular web hosting control panel, to manage and control web hosting services on their servers. Plesk is an alternative to cPanel and offers similar functionality but with a different user interface and feature set. A Plesk license is essential for managing web hosting services on servers. Plesk Admin is suitable for basic hosting management. You can manage not more than three of each of the following: domains, domain aliases, mailboxes, mail accounts, user accounts, and web users.