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" tool 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 important to note that admins (including bureaucrats) already have rollback rights by default. The right can be optional for a user to have rollback and admin combined, but it will not add extra speed even with slower internet connections. Users with rollback rights are just users who are not necessarily an admin.
Rollbackers (users with Rollback rights) can be seen via Special:ListUsers, but they do not by default have any special title that appears on their userpage.
Content Moderators are users who have additional tools available to moderate parts of the community that host the wikia’s content. These tools are: ◾Deleting and moving pages ◾Deleting and moving files ◾Reupload files ◾Protecting and unprotecting pages ◾Patrol pages if the community has the RecentChanges patrol feature enabled
Having this status causes "CONTENT MODERATOR" to appear next to the username on the user's userpage.