American Football (Known as just football in the U.S. and Canada) is a game between 2 teams with 11 players on each team, playing on a field with goalposts at each end. The attacking team, who is in control of the game ball, tries to get to the other side of the field to the opponents goalpost, while the defensive team tries to stop them, and get the ball for themselves.
The attacking team must advance ten yards in four downs (the same as four tries), if they don’t make it, they have to give the ball up to the opponents team, if they succeed, they get to try again with four downs. Points are scored by getting the ball to the opponent’s side of the field, for a touchdown or by kicking the ball through the goalposts for a field goal.
American football evolved in the U.S. but originated from the game of Rugby football. The first American football game was played between two college teams, Rutgers and Princeton, with a mix of rules from both rugby and soccer. A new set of rules was made from 1880 and onward by Walter Camp, the “Father of American Football”