How does an American football team earn a first down?

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In American football, an offensive team earns a first down by advancing the ball at least 10 yards within a series of four downs (attempts).123

Successfully gaining these 10 or more yards grants the team a new set of four downs to continue their drive toward the opponent's goal line. If the offense fails to gain the required yardage after four attempts, they must surrender possession of the ball to the opposing team, which is typically done by punting on the fourth down.12

This system of downs was created by Walter Camp to ensure consistent progress and prevent teams from holding the ball indefinitely, a strategy that had previously led to scoreless ties.3