In baseball, the role of an umpire is crucial for maintaining the integrity of the game. The umpire is responsible for making immediate decisions on the field regarding balls and strikes, safe or out calls at bases, and fair or foul balls. They enforce the rules of the game and ensure players adhere to them. Umpires work in teams to cover different parts of the field, and their decisions can significantly influence the outcome of a game. Their authority and judgment are vital for the fair play and flow of a baseball match.