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Two umpires officiate the game on the field of play, but at international level there's also a third umpire on the sidelines and a match referee.
One umpire stands behind the stumps at the bowler's end of the pitch, while the other umpire stands at square leg.
The umpire at the bowler's end makes decisions on lbw decisions, no-balls, wides and leg byes.
The square leg umpire will judge stumpings and run-outs.
The batsmen should be given any benefit of doubt.
This means that if an umpire is unsure about a decision, then the batsman should be given not out.
The umpires change position at the end of each over.
Only an umpire can give a batsman out after an appeal from the fielding side.
If a batsman stands their ground and no appeal is made by the fielding side, then they shouldn't be given out by an umpire.
The umpires indicate no-balls, byes, leg-byes, wides, boundaries and sixes to the scorers, who keep a running total of the runs scored.
The third umpire uses replays to rule on run-outs, stumpings, whether a ball has hit the ground before being caught or when it's unclear if the ball has crossed the boundary or not.
However, the third umpire can only rule if the decision is referred to them by the umpires out on the pitch.
The match referee rules on disciplinary matters.
If a player shows disagrees by arguing with an umpire about a decision then the match referee can fine the player in question.