Anyone can revert vandalism and bad-faith edits, but it takes a couple of clicks in the page history to get it done. Users with the "rollback" permission are able to undo bad edits with one click, by using the rollback link on diff pages, user contributions list, or the list of recent changes.
It is vitally important that any user with the rollback permission understands the purpose for which it was designed. Users should not request rollback if they do not understand its purpose, as misuse of the rollback power will result in the flag being removed until such a time as the administration decides the user is capable of using it properly. Rollback should be used:
- If the edit is obvious spam or vandalism
- To revert own edits in the user's userspace or accidental edits made by the user him/herself
- To revert edits that were made by a banned user or
- To revert widespread bad edits by a particular user or bot (in the unlikely circumstance the user is misguided or the bot is malfunctioning)
For more information on the appropriate use of rollback, please click this link
It is important to note that sysops already have rollback rights by default. Users with rollback rights are just users who are not necessarily a sysop but are trusted enough to remove vandalism. A list of rollback users can be found at: Special:Listusers/rollback.
How to get rollback
There is no predetermined process to obtain the rollback flag. If you are regularly reverting vandalism edits, it's likely that you will be granted the rollback flag. Rollback is simply an advanced "undo" button, but it should NOT be used to revert every edit that you see to the wiki: Assuming good faith is an important part of being a rollback user.