A "Capper" is a person or device that places caps on bottles or containers. This process is essential in various industries, including food and beverage, pharmaceuticals, and cosmetics, to ensure products are sealed properly for safety and freshness. Capping machines can automate this task, increasing efficiency in production lines. In the context of sports, particularly in baseball, a "capper" can refer to a player who excels at finishing games or making significant contributions in crucial moments. This term highlights the importance of players who can perform under pressure, often leading their teams to victory in tight situations.