Gridiron refers to the field used in American football, characterized by its rectangular shape and marked with yard lines. The term also describes the sport itself, which is played between two teams of eleven players each. The objective is to score points by advancing the ball into the opposing team's end zone. The gridiron field measures 100 yards long and 53.3 yards wide, with end zones extending 10 yards deep. The game is played in four quarters, and teams can score through touchdowns, field goals, and extra points. Key elements include the football, touchdown, and field goal.