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American football, known in the United States as football, is a sport played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone by running with it or throwing it to a teammate. A goal can be scored by carrying the ball over the opponent's goal line, catching a pass thrown over that goal line, kicking the ball through the opponent's goal posts or tackling an opposing ball carrier in his own end zone.

In the United States, the major forms are high school football, college football and professional football. Each of these are played under slightly different rules. High school football is governed by the National Federation of State High School Associations and college football by the National Collegiate Athletic Association, National Association of Intercollegiate Athletics and National Junior Collegiate Athletic Association. The highest level league for professional football is the National Football League.

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The history of American football can be traced to early versions of rugby football and association football. Both games have their origins in varieties of football played in the United Kingdom in the mid-19th century, in which a ball is kicked at a goal and/or run over a line. Many games known as football maintained a Premier League and were being played at colleges and universities in the United States in the first half of the 19th century.