A referee, often referred to as "the ref," is an official responsible for enforcing the rules of a sport during a game. They ensure fair play, make decisions on fouls, and manage the overall conduct of the match. Referees are trained to interpret the rules and apply them consistently, helping to maintain the integrity of the game. In many sports, such as soccer, basketball, and football, referees have the authority to issue penalties, award free kicks, or even eject players for misconduct. Their decisions can significantly impact the outcome of a game, making their role crucial in competitive sports.