A fullback is a position in American football, typically located in the backfield behind the offensive line. This player primarily serves as a blocker for the running back and quarterback, helping to create space for running plays. Fullbacks may also carry the ball on short-yardage situations or catch passes out of the backfield. In addition to their blocking duties, fullbacks are often key players in a team's offensive strategy. They can help protect the quarterback during passing plays and are essential in executing plays that require power running. Fullbacks are usually larger and stronger than other backs, such as running backs.