A referee is like the judge in a game. Just like how the teacher or parent decides who goes first in a game, the referee is there to make sure everyone plays fair and follows the rules. They wear special clothes so everyone knows they are in charge. They blow a whistle when something important happens, like when someone breaks a rule or when time is up. They also keep track of how many points each team has and make sure the game is safe for everyone playing. It's important to listen to the referee and respect their decisions so that everyone can have fun and enjoy the game.