A referee is an official who oversees a sports game or match to ensure that the rules are followed. They make decisions on fouls, penalties, and other infractions, helping to maintain fair play. Referees are commonly found in various sports, including soccer, basketball, and football. Referees are trained to understand the specific rules of the sport they officiate. They often wear distinctive uniforms and carry tools like whistles to signal their decisions. Their role is crucial in promoting sportsmanship and ensuring that the game runs smoothly and fairly for all participants.