And, football is a true team sport. Every player must perform his job flawlessly for the team to win. The player who lines up at the center of the offensive line and snaps the ball back to the quarterback to start the play. A defender who lines up in the defensive backfield, in a corner of the defensive formation, with responsibility for covering pass receivers. The defensive players who play behind the linebackers in the backfield.
Defensive linemen rush the quarterback on passing plays.
A successful attempt, or conversion, scores one point for a kick through the goal posts or two points for running or passing the ball over the goal line. If the ball goes through the goal posts, it is worth 3 points. The loss of possession of the ball when the carrier drops it or has it knocked out of his hands. Either team can recover a fumble. The recovering team starts the next play on offense.