What an offensive tackle does
An offensive tackle protects the quarterback and helps open running lanes by blocking defenders at the outer edges of the offensive line.
It's often said that an offensive tackle is mainly supposed to tackle opponents — in fact, the position is named for blocking, while tackling is usually a defensive player's job.
Offensive tackles are part of the five-player offensive line, which works under the coach's play design to give the offense time and space to gain yards; they do not handle the ball on most plays.
Imagine the quarterback is carrying a fragile package while teammates try to move forward, and the tackles act like big bodyguards who block people from reaching him or stopping the path.
Knowing the tackle's job makes football easier to follow whenever commentators talk about pass protection, the pocket, running lanes, or why a play broke down.
Suppose a play calls for the quarterback to throw to a receiver on the right side. The right tackle blocks the defender rushing from that edge, giving the quarterback time to throw; on a running play, that same tackle may push or steer a defender away from the planned path.
They protect the outside edge
Tackles must handle pass rushers coming around the sides, where defenders can reach the quarterback quickly if they get past the block.
They use positioning more than force
A tackle tries to stay between the defender and the play while keeping balanced, because grabbing or knocking down an opponent illegally can draw a penalty.
Left and right roles differ
The left tackle often faces the quarterback's blind-side pressure for a right-handed passer, while the right tackle may have different blocking assignments based on the play.