Fantasy football is an interactive competition in which users compete against each other as general managers of virtual teams. The players that an individual is able to manage are professional American football players in the National Football League. The different actions people are able to make are drafting, trading, adding or dropping players, and changing rosters. Due to the growth of the Internet, Fantasy football has vastly increased in popularity, particularly because Fantasy football providers such as ESPN, Yahoo, CBS, and the NFL itself are able to keep track of statistics entirely online, eliminating the need to check box scores and newspapers regularly to keep track of players. Most leagues have a single week championship in Week 16 of the NFL season.