Canon

The set of official facts, events, and history of the world and the people who live in it of a franchise. Although all canon relates to a franchise, not every franchise necessarily has canon. One could lack canon because its characters' backstories keep changing and there is no definite history for them. When something happens that isn't or can't be considered canon, it's called non-canon, the opposite of canon that doesn't count towards the official events in a franchise and may be the creators' way of using the canonical characters and locations in ways that the canon won't allow.