Rollback users are users that are in between administrators and normal users. They have a few extra abilities which includes deleting pages and reverting bad edits with one click. Becoming a Rollback user is simple and you must meet these requirements:
- Be an active editor for at least two weeks
- Have at least 100 edits on articles (Earn the Champion badge)
- Have helped to fight vandalism, spam, trolling, etc.
- Have not been blocked
Rollback users are meant to help out the admins and the bureaucrats. There is no limit to the number of Rollback users.(Note: You can request for Rollback rights here)