NFL League or National Football League is a professional American Football League. It consists of 32 teams. National Football League is divided between National Football Conference (NFC) and the American Football Conference (AFC). Being one of the major professional sports league in the United States, particularly in North America, National Football League is a 17 week regular season that begins the week after Labor Day and goes on until the week after Christmas Since its inception in 1920, National Football League has gone through a number of changes.