The first use of the VAR system at the World Cup was at Russia 2018, and it has been widely used in subsequent tournaments.VAR uses video replay technology to help referees make the right decisions during matches. The match referee consists of the home referee and the VAR referee, who is responsible for monitoring the game: goals, offside, red cards and other events on, and sends information to the home referee when needed, and the home referee can use the information provided by the VAR system to make more accurate decisions.