The National Football League (NFL) is a professional American football league composed of 32 teams, divided equally into the American Football Conference (AFC) and the National Football Conference (NFC). Each conference has four divisions: East, North, South, and West. The NFL season consists of a three-week preseason, followed by an 18-week regular season, and a playoff tournament culminating in the Super Bowl. The NFL is one of the most popular and valuable sports leagues in the world.