The object is simple to state and hard to execute: ground the ball inside the opponent's 9-by-9-metre court, or force them into an error, before they can do the same to you. A team may contact the ball three times - conventionally a dig or pass, a set, and an attack - and must send it back over the net without catching, carrying or hitting it twice in a row. A block does not count as one of the three touches. Every rally ends in a point for one side; there are no ties and no clock.
A match is a race to win three sets. The first four sets are played to 25 points and the deciding fifth to 15, each with a two-point margin required, so a set can stretch well beyond its target - 28-26, 30-28 - until one side leads by two. Teams rotate one position clockwise each time they win back the serve, so every player serves, defends the back row and attacks the front in turn, subject to substitution and the libero exception.
Scoring at a glance
Core rules
Three contacts and no more
A team may touch the ball a maximum of three times before it must cross the net, and the same player may not make two consecutive contacts. The classic sequence is pass or dig, then set, then attack. A team block is the exception - it does not count as one of the three team touches, so the same player who blocks may make the next contact. Letting the ball hit the floor, sending it out of bounds, or needing a fourth touch all end the rally in the opponent's favour.
Rotation and serving order
The six players line up in a fixed rotational order recorded on the lineup sheet. When a team wins back the right to serve, all six rotate one position clockwise, so the player who was front-right in zone 2 moves to serve from the back-right in zone 1. This constant rotation is why every athlete must play front and back court, and it is the reason systems like the 5-1 exist - to keep a single setter running the offence through all six rotations.
The overlap rule
At the moment the server strikes the ball, players must hold their correct rotational order relative to their neighbours - no back-row player may be closer to the net than the front-row player they sit behind, and adjacent players in a row may not cross. Break this and the referee calls a positional or overlap fault, awarding the point and serve to the other side. The instant the serve is contacted, players may release to their specialist base positions.
The serve
Every rally begins with a serve struck from behind the end line within eight seconds of the referee's whistle. The server may not step on or over the line until after contact, or it is a foot fault. Modern players overwhelmingly use the jump serve or jump-float, launching the ball with a running approach to generate pace or unpredictable movement. A serve may clip the net and remain in play - the service let was abolished in 2001 - and is legal as long as it lands inside the opponent's court.
Front row, back row and the attack line
The attack line, three metres from the net, divides each half into front and back zones. Front-row players may attack or block a ball from any height. A back-row player may still attack, but must take off from behind the attack line to hit a ball that is entirely above the top of the net - the basis of the pipe and back-row attacks. Back-row players may never block. Misjudging that line is a common back-row-attack fault.
The libero
Introduced in 1998, the libero is a back-row defensive specialist in a contrasting jersey who may replace any back-row player without counting against substitutions. The libero cannot serve, save for limited local exceptions, cannot block or attempt to block, and cannot attack a ball that is entirely above the net's height. If the libero uses an overhand finger-set to feed an attacker while on or in front of the attack line, that attacker may not hit the ball above net height. The role transformed back-court defence and serve-receive.
Legal contact
The ball must be struck cleanly, not caught, held or thrown; an obvious lift or carry is whistled. A player's first team contact - typically a hard-driven serve or spike reception - may involve a momentary double touch off the platform and still be legal, but a double contact on a set is faulted. Contact with any part of the body is allowed, including the foot. Four team touches, or two consecutive contacts by one player outside the block, both end the rally.
The net and centre line
Players may not touch the net during an action of playing the ball; incidental contact away from the play is now generally permitted after a 2013 refinement of the rule. Reaching over the net to block is legal only once the opponent has attacked; reaching over to attack is not. A player may cross the centre line with a foot or hand provided part remains on or above the line and it does not interfere with opponents - full penetration into the opponent's court is a fault.
Fouls & penalties
Rotational and overlap faults
If players are out of their correct serving order, or overlap a neighbour at the moment of the serve, the referee awards a point and the serve to the opponent. Serving out of turn is penalised the same way, and if it is discovered later, points scored while the wrong server was up are cancelled. These faults are why coaches drill exact starting alignments for all six rotations.
Net and centre-line violations
Touching the net during an action of playing the ball is a fault, as is interfering with an opponent by reaching fully across the net or penetrating completely under it past the centre line. Blocking a set or a served ball on the opponent's side is illegal. These calls are among the most video-challenged, since a fingertip brush of the net tape can decide a rally.
Ball-handling faults
The ball must be hit, not held. A visible catch, lift or throw is a fault, as is a double contact on a set - the tell-tale sign being the ball spinning off uneven hands. A team is also faulted for four contacts, or for the same player touching the ball twice in a row when not blocking. First-contact judgement is more lenient, allowing hard-driven balls to rebound off a double touch.
Back-row and blocking faults
A back-row player who attacks a ball entirely above the net from in front of the attack line commits a back-row-attack fault. Back-row players and the libero may not block at all; a completed block by either is a fault. Likewise, blocking the opponent's serve is illegal. Referees also fault a libero who attacks a ball above the net or who hand-sets an attacker illegally from the front zone.
Serving faults
The server must strike the ball within eight seconds of the whistle, from behind the end line, without stepping on or over it before contact. A ball served into the net, out of bounds, or that passes outside the antennae is a fault and hands the point to the receivers. Screening - teammates hiding the flight of the serve from the receivers - is also prohibited, though it is rarely called at elite level.
Match format
A full international match is best-of-five sets and has no clock, so its length depends entirely on how the rallies fall - typically 90 minutes to well over two hours. Sides switch ends between sets and, in the deciding fifth set, at eight points. Each team has two 30-second time-outs per set, supplemented by technical time-outs in some formats, and up to six substitutions, with libero swaps handled separately.
The winner is the first to three sets. Because the first four sets are to 25 and the fifth to 15, always by a two-point margin, a match can be won 3-0 in under an hour or dragged to a 3-2 thriller decided 17-15 in the fifth. There are no draws. In pool play, some competitions award standings points by set difference, rewarding a 3-0 over a 3-2 to keep matches meaningful even in defeat.
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