A good question to start with. Everyone knows what fiction is, and if you do you'll also understand why I'm glad I'm not trying to define it.
Creative writing is broader still.
In my world there are writings orientated to conveying factual information and writings orientated to other things like the emotions. There is a shift from being led through a story, a relatively author-controlled experience, towards one of a reader exploring a world created by an author, where the reading experience is more a joint project of writer and reader. The degree of the shift can of course vary sharply. Film, for example, changed the way writers told or presented a story, but the story-form was still recognisable as such. The interactive story implies a form which is not that of narrative, within which the position, and authority of the narrator is dispersed among the readers, and in which the idea of cinema, or of literature, merges with that of the game, or of sport.