Cornerbacks are defensive players in American football who primarily cover wide receivers. Their main job is to prevent the receiver from catching the ball by staying close and using their speed and agility to react to the receiver's movements. They often play on the outside edges of the field, known as the "corners," which is where they get their name. In addition to covering receivers, cornerbacks also need to be skilled at tackling and reading the quarterback's intentions. They may also intercept passes, which can lead to turnovers and change the momentum of the game. Overall, cornerbacks play a crucial role in a team's defensive strategy.