A defensive back is a player on a football team whose primary role is to defend against the opposing team's passing plays. This position includes various roles, such as cornerbacks and safeties, who work together to prevent receivers from catching the ball. They must be quick, agile, and skilled in reading the quarterback's intentions. Defensive backs also play a crucial role in tackling and stopping running plays. They often need to anticipate the offensive team's strategies and react quickly to changing situations on the field. Their performance can significantly impact the outcome of a game, making them essential to a team's defense.