A cornerback (CB) is a defensive player in football who guards against the offensive team, particularly any player that may catch the football on the opposing team. Most of the time, cornerbacks line up opposite the offense’s wide receivers, guarding them in order to prevent a completed pass. They are part of the defense’s secondary and line up across the offense’s wide receivers. A cornerbacks primary job is to be disruptive in the passing game. They must understand everything about the receiver they line up against and keep up with their speed in order to get the job done. In addition to defending against runs and pass attempts, cornerbacks work to create turnovers on the field. Typically, this is accomplished by intercepting passes, but hard-hitting cornerbacks can also use their position on the field to tackle ball carriers and force a fumble. A cornerbacks responsibilities vary depending on how the defense assigns protection to its defensive secondary. They can play man coverage or zone coverage, and they may be assigned to blitz depending on the coaching decisions in a game.