Thread:KungAvSand/@comment-4839682-20121213020418/@comment-4975807-20121213205922

A user with rollback rights means the person has rights to "rollback" another person's edit instead of just undoing it. For example, if a page is vandalized, the person with rollback rights can just use the rollback button to actually undo the edit to the person who edited the page before the vandalism occurred. It's different from an undo where a person would actually have to go on the edit screen and manually delete inappropriate content.