Fringe wasn't canceled, it ended.
Sort of in between, actually. "Canceled" is when the network ends the show (due to low ratings/high costs, usually) before the producers feel it's reached its natural endpoint. "Ended" is when the producers choose to wrap it up. Fringe
is a case where the network decided that the ratings weren't good enough to keep making the show any longer, but they were very supportive of the producers and fond of the show, and thus agreed to give them one more half-season to conclude the story. So it was kind of a "cushioned cancellation," you could say. (Kind of like what Warehouse 13
is getting -- the network decided to end it prematurely, but is giving them a 6-episode mini-season to wrap it up next year.)