(n) an AMAZING website where the world is literally your study group. You ask a question and people around the world answer. It has many features.
Joe: Damnit, I have a huge math test tomorrow! I better study...(Five hours later) Ugh! What plus X is Z?
(Joe goes on OpenStudy, enters question)
Random Contributor: X+Y=Z
Joe: OH! I GOT IT NOW!
(The next day)
Joe: Sweet! I got an 100 on my test! Thanks, OpenStudy!