The description for this says it is: "First rollback"; however I have no idea what this means. Could someone explain?
1\$\begingroup\$ From time to time, certain users become really addicted to the editing feature, and start making truly silly edits just to highlight words - that only produces pointless churn. But sooner or later they carelessly break things in an edit, leaving dangling words, removing key qualifiers, etc - then someone has to go and cleanup by rolling back to the last version of the question which fully captured the original author's message. \$\endgroup\$– Chris StrattonJun 26, 2013 at 17:33
This is a bit less prevalent now that edits are peer reviewed. However, if someone edited a post in such a way that was not productive, you could "rollback" the revision to the last good version.
Click on the "edited on ****" link on an edited post, and all previous revisions will show a set of links:
source edit rollback link. The rollback simply discards all revisions after the version that you are rolling back to.
The last time I remember using it was for undoing some excessive retagging of a question.
\$\begingroup\$ Thanks for clearing that up for me. \$\endgroup\$ Jun 24, 2013 at 21:49