: Led by the quarterback , who calls plays and directs the unit. It includes the offensive line (blockers), running backs , wide receivers , and tight ends .

: The team with the ball (offense) has four chances, known as downs , to advance the ball at least 10 yards. If successful, they earn a "first down" and another set of four downs to continue their drive.

: The team without the ball tries to stop the offense's advance by tackling the ball carrier, intercepting passes, or forcing fumbles to gain possession. Player Units and Positions

: The offense moves the ball by running (usually a handoff to a running back) or passing (the quarterback throws the ball to a receiver).