There are six players on each team in volleyball: one setter, two outside hitters, two middle blockers, and one defensive specialist. The positions are not set in stone, and players often move around during the course of a game. But, generally speaking, these are the positions that each team has on the court. The defensive specialist is a player who specializes in playing defense. They may be called upon to block the other team's hitters, dig balls out of the defensive zone, or cover for other players who are out of position.