American football American football (referred to simply as football in the United States and Canada), also known as gridiron, is a team sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with ...

, jammers are a specialized type of

cornerback A cornerback (CB) is a member of the defensive backfield or secondary in gridiron football. Cornerbacks cover receivers most of the time, but also blitz and defend against such offensive running plays as sweeps and reverses. They create tur ...

. Their task is to try to slow down gunners during punts by preventing them from getting a free release, giving

punt returner A return specialist or kick returner is a player on the special teams unit of a gridiron football team who specializes in returning punts and kickoffs. There are few players who are exclusively return specialists; most also play another position ...

s more time to return punts.Seahawks’ Punt Team Is Flashy With Play, Not Name
/ref> A jammer is typically played by a back-up for another position. The term "jammer" is seldom used.

References

{{American football positions American football positions