The National Football League (NFL) is the highest level of professional American football in the United States. It was formed by eleven teams in 1920 as the American Professional Football Association, with the league changing its name to the National Football League in 1922. The league currently consists of thirty-two teams from the United States. The league is divided evenly into two conferences — the American Football Conference (AFC) and National Football Conference (NFC), and each conference has four divisions that have four teams each, for a total of 16 teams in each conference. The NFL is an unincorporated 501(c)(6) association,[1][2][3] a federal nonprofit designation,[4] comprising its 32 teams.[5][6]The regular season is a seventeen-week schedule during which each team plays sixteen games and has one bye week. The season currently starts on the Thursday night in the first full week of September (the Thursday after Labor Day) and runs weekly to late December or early January. At the end of each regular season, six teams from each conference (at least one from each division) play in the NFL playoffs, a twelve-team single-elimination tournament that culminates with the championship game, known as the Super Bowl. This game is held at a pre-selected site which is usually a city that hosts an NFL team.
The NFL is by far the most attended domestic sports league in the world by average attendance per game, with 67,509 fans per game in the 2009–10 regular season[7] and 66,960 fans per game in 2010–11.[8] Although not as frequently as the other major professional sports leagues in the United States, the NFL still is not immune to labor disputes, such as the player's strikes of 1982 and 1987, and more recently a lockout in 2011.
