Referee
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A referee is an official, in a variety of sports and competition, responsible for enforcing the rules of the sport, including sportsmanship decisions such as ejection. The official tasked with this job may be known by a variety of other titles depending on the sport, including umpire, judge, arbiter (chess), commissaire, or technical official. Referees may be assisted by umpires, linesmen, timekeepers, touch judges, or video review officials.
An ice hockey referee
A referee (right) issues a yellow card to a player during a game of association football.
An American football referee (right, in white cap) announces a call. The other officials wear black caps
Gaelic football ref in blue
Instant replay
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Instant replay or action replay is a video reproduction of something that recently occurred which was both shot and broadcast live.
EVS LSM remotes in an OB Production Truck
Umpires in St.Louis await the ruling.
NBA referees reviewing a play
VAR monitor at the Estadio Monumental David Arellano