The National Football League is a professional American football league consisting of 32 teams, divided equally between the National Football Conference and the American Football Conference . The NFL is one of the four major North American professional sports leagues, the highest professional level of American football in the world. The NFL's eighteen-week regular season runs from early September to early January, with each team playing seventeen games and having one bye week. Following the conclusion of the regular season, seven teams from each conference advance to the playoffs, a single-elimination tournament culminating in the Super Bowl, which is usually held on the first Sunday in February and is played between the champions of the NFC and AFC. The league is headquartered in New York City.