What is a touchback in football?

Answer 1

A touch back is when a Kick Return or a Punt Return has landed into the opposing EndZone and is placed on the 20 yard line, or if the opposing team catches the ball in the End Zone and Kneels. A nickle back is a third Corner Back in 3-4 Formations or Cover 2 Formations they are usually their to Cover the Slot Reciever.

Answer 2

A touchback is usually seen in football when either at the begining of a game, after the half, or after a team scores a team kicks the ball off to the other team.

Touchback:

If the kickoff or punt leads to the ball going out of bounds in the end zone or stopping within the endzone then the receiving team gets the ball at the 20 yard line.

A touchback can also occur on a interception or fumble recovery in the end zone.