American football (referred to as footballinthe United States and also known as gridiron) is a sport playedbytwo teams of eleven players on a rectangular field withgoalpostsat each end. The offense, the team with control of theoval-shapedfootball, attempts to advance down the field by runningwith orpassing the ball, while the team without control of theball, thedefense, aims to stop their advance and take control ofthe ballfor themselves. The offense must advance at least ten yardsin fourdowns, or plays, or else they turn over the football totheopposing team; if they succeed, they are given a new set offourdowns. Points are primarily scored by advancing the ball intotheopposing team's end zone for a touchdown or kicking theballthrough the opponent's goalposts for a field goal. The teamwiththe most points at the end of a game wins.
American football as a whole is the most popular sport in theUnitedStates; professional football and college football are themostpopular forms of the game, with the other major levels beinghighschool and youth football.
American football evolved in the United States, originating fromthesport of rugby football.
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