Umpires' decisions refer to the rulings made by umpires in sports such as baseball, cricket, and softball. Umpires are responsible for making calls on plays, including whether a pitch is a ball or a strike, whether a runner is safe or out, and whether a batted ball is fair or foul. The term 'CALLS' is used to refer to these decisions, which are based on the umpire's interpretation of the rules and regulations of the sport. Umpires' decisions are final and cannot be overturned.