Pass interference happens when a player significantly restricts an eligible opponent’s chance to catch a forward pass. Learn defensive and offensive PI, legal contact, penalties, examples, and common myths.

A punt trades possession for field position, usually on fourth down. Learn how punts, fair catches, touchbacks, muffs and punt returns work.

A sack ends an apparent passing play at or behind the line of scrimmage. Learn what counts, how sack stats work, and how sacks differ from tackles for loss.

A quarterback leads the offense, communicates the play, reads the defense and decides whether to hand off, pass or run. Here is every major responsibility explained.