The main function of a "goalkeeper" in team sports, such as soccer and hockey, is to prevent the opposing team from scoring by protecting the goal. This involves not only blocking shots but also positioning, communication with defenders, and strategic decision-making during play. Goalkeepers often possess unique skills, including quick reflexes, agility, and the ability to read the game. Their performance is crucial in tight matches, and a strong goalkeeper can often be the difference between winning and losing, making them a pivotal component of their team's success.