Why do some movies and TV shows have an extra scene after showing credits? Movies like The Avengers and X-men are some examples. Are post-credits scenes and end-credit scenes different?
The post-credit scenes are used as a way to make sure you watch the entire movie, credits and all. It also provides a break between the movie and the post-credit scenes. Sometimes they're "stingers", sometimes they're bloopers, sometimes they're additional comedic bits.
The scenes after the credits are usually "stingers". They were used as links or hookups to sequels. Now they are used as way to introduce characters and elements that will be present in a franchise.