Cornerbacks are defensive players in American football who primarily cover wide receivers to prevent them from catching passes. They line up near the line of scrimmage and use their speed and agility to stay close to their assigned receiver. Their main goal is to disrupt the passing game by intercepting the ball or deflecting passes. In addition to pass coverage, cornerbacks also play a role in run defense. They need to be able to tackle effectively and support their teammates in stopping the opposing team's running plays. Overall, cornerbacks are crucial for a team's defensive strategy, helping to limit the offense's scoring opportunities.