Scoring
A team scores a touchdown by entering its opponent's end zone while carrying the ball or catching the ball while being within the end zone. If the ball is carried by a player, it is considered a score when any part of the ball is directly above or beyond any part of the goal line between the pylons. In addition, a two-point conversion may be scored after a touchdown by similar means. The National Football League changed its rule in 2007, so that a ball carrier merely touching the pylon is insufficient to score a touchdown; the ball must actually enter the end zone.
Read more about this topic: End Zone