Sep 7, 2017; Foxborough, MA, USA; A display shows helmets from each of the NFL teams outside Gillette Stadium before the a NFL game between the New England Patriots and Kansas City Chiefs. Mandatory Credit: David Butler II-USA TODAY Sports
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NFL - National Football League. This is the professional American football league. It is the most popular and the richest (in terms of income) American football league. The league was founded in 1920 as the American Professional Football Association (APFA).
There are currently 32 teams in the League, which are equally divided between the National Football Conference (NFC) and the American Football Conference (AFC).
The regular season lasts 17 weeks (September to December). As a result of the season, 7 teams from each conference go to the playoffs, which ends with the Super Bowl. In the final, the AFC and NFC champions compete with each other.