As its name states, safety is the defense's last line of defense. The safety's job is to make sure no offensive players run or catch a touchdown. They are often the deepest player on the defensive side of the football.

What is the job of a strong safety?

The strong safety tends to play closer to the line than the free safety does, and assists in stopping the run. He may also cover a player, such as a running back or fullback or H-back, who comes out of the backfield to receive a pass.

What is a safety in NFL?

It is a Safety: if the offense commits a foul in its own end zone or; when an impetus by a team sends the ball behind its own goal line, and the ball is dead in the end zone in its possession or the ball is out of bounds behind the goal line.