User blog comment:Rappy 4187/Technical Update: November 30, 2016/@comment-31248264-20161130221314/@comment-1824272-20161130231331

Shouldn't get confused between "pin" and "highlight" - there's a distinct difference.


 * Pinning something means **making it stick** to the top of its feed.
 * Highlighting something **sends a notification** to every user so they see the discussion.

Highlighting is currently available in Fandom's thread-style forums. Pinning is not. But both would be extremely useful and almost necessary to have in Discussions, so I hope we see both eventually.