American football is a sports played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone. Known in the United States as football, it may also be referred to informally as gridiron. The ball can be advanced by running with it or throwing it to a teammate. Points can be scored by carrying the ball to the opponents goal line, catching a pass thrown over that goal line, kicking the ball through the opponent's goal posts or tackling the opposing ball carrier in his own end zone.
The history of American football can be traced to early versions of rugby football. The game have its origins in varieties of football played in the United Kingdom in the mid-19th century, in which a ball is kicked at a goal, or run over a line. Many games known as "football" were being played at colleges and universities in the United States in the first half of the 19th century.
American football resulted from several major divergences from rugby football, most notably the rule changes instituted by the consideration of the Walter Camp, considered the "Father of American Football". Among these important changes were the introduction of the line of scrimmage and of down and distance rules. In the late 19th and early 20th centuries, game play developments by college coaches which helped take advantage of the newly introduced forward passThe popularity of American Football grew as it became the dominant version of the sport for the first half of the twentieth century. Bowl Games, a college football tradition, attracted a national audience for collegiate teams.