A fullback is a position in American football, typically responsible for blocking for the running back and protecting the quarterback. They often carry the ball themselves, especially in short-yardage situations, using their strength to gain tough yards. Fullbacks are usually larger and more powerful than other backs, making them essential for physical plays. In addition to their offensive duties, fullbacks also play a key role in special teams. They help create openings for kick returners and can even tackle opponents during kickoffs. Notable fullbacks like Mike Alstott and Larry Csonka have made significant impacts in the game, showcasing the importance of this versatile position.