High Quality Content by WIKIPEDIA articles! Part of the confusion with American Football position names is that they are based on the role the player normally has in the offense, rather than necessarily his position at the start of the play. Tight Ends, for instance, usually line up to the outside of one of the offensive tackles. However, a Tight End might also line up in the area usually reserved for a Wide Receiver, or even take the place of a Fullback in the offensive backfield; such Tight Ends are usually called H-Backs. You also might not be able to tell the difference between the Halfback and the Fullback by where they are lined up. Their main difference instead is based on their role in the offense (Halfbacks run more, while Fullbacks are usually used to block).