News satire is a type of parody presented in a format typical of mainstream journalism, and called a satire because of its content. News satire has been around almost as long as journalism itself, but it is particularly popular on the web, with websites like The Onion, where it is relatively easy to mimic a legitimate news source. News satire relies heavily on irony and deadpan humor. Two slightly different types of news satire exist. One form uses satirical commentary and sketch comedy to comment on real-world news events, while the other presents wholly fictionalized news stories.
(Definition taken from Wikipedia)