What is a fullback in football?

A fullback in football is a player who is positioned behind the quarterback and in front of the halfback. Fullbacks are typically larger and more physical players compared to running backs, and their primary role is to block for the running back. However, they can also be utilized as a runner or receiver in certain situations. Fullbacks are also essential in short-yardage situations, where their size and power can be used to gain tough yards. In recent years, the use of fullbacks in the NFL has decreased as teams become more pass-heavy, but they remain an important part of many offensive schemes.