The National Football League is one of the most popular, professional sports league consisting of 32 teams. They are split into two conferences, the NFC and the AFC. The NFL was formed in 1920. called the American Professional Football Association and today has the highest average attendance of any professional sports league in the world. One fun fact about NFL players is this: they weren't required to wear helmets until 1943. More then 100 million people watch the Super Bowl every year because it is among the biggest club sporting events in the whole world