a libero is the backrow defense specialist, they are allowed to sub for any backrow player when the ball isn't in play without previous permission from the refs. they wear a different color jersey.
they actually sub in for front row hitters who aren't as strong in passing, when they rotate to the back row.
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The libero is a player specialized in defensive skills: the libero must wear a contrasting jersey color from his or her teammates and cannot block or attack the ball when it is entirely above net height. When the ball is not in play, the libero can replace any back-row player, without prior notice to the officials. This replacement does not count against the substitution limit each team is allowed per set, although the libero may be replaced only by the player whom he or she replaced.
The libero may function as a setter only under certain restrictions. If she/he makes an overhand set, she/he must be standing behind (and not stepping on) the 3-meter line; otherwise, the ball cannot be attacked above the net in front of the 3-meter line. An underhand pass is allowed from any part of the court.
The libero is, generally, the most skilled defensive player on the team. There is also a libero tracking sheet, where the referees or officiating team must keep track of who the libero subs in and out for. There may only be one libero per set (game), although there may be a different libero in the beginning of any new set (game). That is, the libero can only serve for one person, not for all of the people for whom he or she goes in.
A libero is a person on the team that wears a different colored jersey from everyone else. They don't need to be "officially" subbed in, they just run in and switch. The libero cannot serve the ball and is a backrow player. They can't be in the front row but they are aloud to do a backrow attack. Mostly they are just the teams best passer.
a player who specializes in defense
they where a different color jersey, and they cannot play front row