The National Football League (NFL) is a professional football organization based on the East Coast of the United States - it is the sister league of the Midwest's American Football League (AFL) and West Coast-based Western Football Association (WFA). The NFL was formed in 1938 with only six teams - today, it fields 16 teams in two eight-team divisions. The NFL season has 12 league games as well as four exhibition games against opponents from the other two leagues. The NFL is the only of the three professional football leagues in which all 16 members have won the NFL championship.