American football is played between two teams of 11 players on the field, and in four 15 minute quarters. The teams are allowed three time-outs of 12 minutes each per half. If at the end of the game, the scores are tied, the teams move into sudden-death overtime. The main aim is to move the ball toward the opposite team’s end zone. The offense moves the ball downwards in 10-yard chunks which are signified by markings on the field. Each chance to gain those ten yards is a down, the first ten yards being counted as the first down. Each team has four chances to earn those 10 yards; if the offense fails to utilize these four downs, they surrender the ball which is usually punted/kicked to the defending team on the fourth down.
A touchdown can be scored from anywhere on the field, or another scoring that comes from the defense’s end zone, by means of various plays that are called by the head coach or the quarterback of the team, which are countered by the defense’s plays.
Scoring varies depending on positions. A touchdown is worth six points and is earned by crossing the opposition’s goal line with the ball, or by catching or collecting it in the end zone. A field goal earns the team three points and is attempted in the fourth down if the kicker is close enough to kick the ball through the uprights. One or two points are scored through extra points which can be earned by kicking the ball through the uprights after a touchdown, and by taking the ball into the end zone again respectively. A safety, worth two points, will be awarded to the defense when a member of the offense is tackled with the ball in their own end zone.