The main function of a referee in sports is to enforce the rules during a match, ensuring fair play and maintaining order. Referees have the authority to penalize players for infractions, award fouls, and make decisions on game-related issues. Their presence is crucial for upholding the integrity of the game and providing a level playing field for all competitors. In team sports, the referee's decisions can significantly influence the outcome, making their role one of the most important for sportsmanship.