Linesmen are officials in sports, particularly in football and ice hockey, responsible for assisting the main referee. They help enforce the rules of the game, monitor player conduct, and make decisions on offside and fouls. Their presence ensures fair play and helps maintain the flow of the game. In football, linesmen are positioned along the sidelines, while in ice hockey, they skate on the ice. They use flags or signals to communicate decisions to the referee and players. Their role is crucial for accurate officiating and enhancing the overall experience of the game for players and fans alike.