Tight End

The Tight End (TE)(Also called: Y) is an Offensive Position, positioned at the end of the Offensive line. There can be 1 or none, in the play, depending on how many Wide Receiver there is on the offensive line.

Responsibility
There are several responsibilities the Tight End overcomes. During a running play, the Tight End, has to block any Defensive End from passing you. During a Passing Play (depending of what play it is), the Tight End becomes responsible of either driving the Defensive End back and then acting as a Wide Receiver, or just blocks the Defensive End.

Running Play
Most likely the Running Back will run behind you and will need some cover from the Tight End. This is where the Tight End blocks the Defensive End. As the Running Back runs to the sidelines, the Defensive End will try to come off of you and run directly to the Running Back. The Tight End's job here is to get in front of the Defensive End, preventing him from performing a tackle on the Running Back.

Passing Play
This depends heavily on the play that is called, by the Quarterback. If he says it's a Block play for the Tight End, but a passing play for the Wide Receiver, then the Tight End will block. If the Quarterback calls a passing play for the Tight End, then the tight end will drive the Defensive End back 5 yards, and you will run the route he has called.