Rollback, the easier and faster method of undoing edits, is granted automatically to all Sysops and Bureaucrats. It is also an ability that can be granted to users to make undoing vandalism and edits by problem users easier. On My English Wiki, rollback users are generally trusted users who are experienced and are capable of helping the admins with vandalism. A list of Autoconfirmed users with rollback powers can be seen here.