Tight end

The tight end (TE) is a position in American football, Arena football, and formerly Canadian football, on the offense. The tight end is often seen as a hybrid position with the characteristics and roles of both an offensive lineman and a wide receiver. Like offensive linemen, they are usually lined up on the offensive line and are large enough to be effective blockers. On the other hand, they are eligible receivers adept enough to warrant a defense's attention when running pass patterns.

Because of the hybrid nature of the position, the tight end's role in any given offense depends on the tactical preferences and philosophy of the head coach. In some systems, the tight end will merely act as a sixth offensive lineman rarely going out for passes. Other systems use the tight end primarily as a receiver, frequently taking advantage of the tight end's size to create mismatches in the defensive secondary. Many coaches will often have one tight end who specializes in blocking in running situations while using a better pass catching tight end in obvious passing situations.

Offensive formations may have as few as zero or as many as three tight ends at one time. If a wide receiver is present in a formation, but outside the tight end, the wide receiver must be positioned behind the line of scrimmage (see figure at right), since he is in the backfield, not on the line. If two tight ends are on the same side of the line of scrimmage, one must be behind the line of scrimmage, or the one not at the end of the offensive line has to report himself as non-eligible receiver. Also the offensive coordinator could use the tight end for a fullback.

The advent of the tight end position is closely tied to the decline of the one-platoon system during the 1940s and '50s. Originally, a rule derived from the game's evolution from other forms of football limited substitutions. Consequently, players had to be adept at playing on both sides of the ball, with most offensive linemen doubling as defensive linemen or linebackers, and receivers as defensive backs. At that time, the receivers were known as either ends or flankers, with the end lining up wide at the line of scrimmage and the flanker positioned slightly behind the line usually on the opposite side of the field.

...
Wikipedia