National Football League

The National Football League is the major professional American football league in the United States, comprising 32 teams split between the American Football Conference and National Football Conference.

NFL regular season: The NFL's annual schedule of games through which teams compete for playoff places. Regular-season results determine which teams advance to the postseason.
American Professional Football Association: The professional football organization founded in 1920 that became the NFL in 1922. The NFL began under this earlier name.
NFL salary cap: A league-wide limit on the amount teams may spend on player salaries under the collective bargaining agreement. The cap constrains team payrolls and supports competitive balance.
Concussion in American football: A brain injury caused by a blow or jolt to the head, a recurring risk in American football. Concussion risks have prompted changes in NFL rules, medical protocols, and public scrutiny.
NFL playoffs: The NFL's single-elimination postseason tournament that selects the conference champions and Super Bowl participants. The playoff bracket turns regular-season qualification into a championship contest.
AFL–NFL merger: The agreement that united the American Football League and NFL into one professional league, completed in 1970. The merger created the two-conference structure that defines today's league.
NFL collective bargaining agreement: The labor contract negotiated between the NFL and the NFL Players Association. It sets rules for player compensation, benefits, and working conditions.
Chronic traumatic encephalopathy: A degenerative brain disease associated with repeated head impacts and diagnosed after death. Research into CTE has intensified debate over the long-term safety of NFL football.
Super Bowl: The annual championship game between the NFL's conference champions. The league season culminates in this game.
American Football League: A professional American football league that competed with the NFL from 1960 until its 1970 merger. Its challenge forced the NFL toward expansion and eventual consolidation.

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