Plesk Web Admin Edition is built for website and server administration.
It supports up to 10 domains and includes WordPress Toolkit SE.
It is licensed to be used inside VPS server.
Plesk Web Host Edition is designed to help you to build and grow your hosting business. It supports unlimited domains and includes WordPress Toolkit, Subscription Management, Account and Reseller Management. It is licensed to be used inside VPS server.
Plesk Web Pro Edition is built for web developers and web designers.
It supports up to 30 domains and includes WordPress Toolkit, Subscription and Account Management. It is licensed to be used inside VPS server.