Cover 3

Cover 3
Cover 3 diagram
Overhangs If you are not blitzing you will have the flat to your side.
Backers You along with the Overhangs are responsible for the two hook to curls and the flats. If you are the outside most defender underneath you will have the flat. If you are the 2nd defender to your side you will have the hook to curl.
Corners You have the deep third on your side. NOTHING BEHIND YOU!
Safety You have the deep middle. NOTHING BEHIND YOU!