Cover 3 is a defensive football scheme that divides the field into three deep zones, each covered by a safety or cornerback. The primary goal is to protect against deep passes while allowing for flexibility in defending against short and intermediate routes. In this formation, the two cornerbacks typically cover the outside deep zones, while the free safety takes the middle deep zone. The linebackers and other defensive backs focus on short routes, providing support against runs and quick passes. This strategy helps teams balance their defense against various offensive plays.