Cover 1 might be the most popular coverage in in the NFL. And though new Browns Devensive Coordinator Steve Wilks runs a considerable amount of zone coverage, he will run Cover 1 a fair amount as well.
Cover 1 is a man to man coverage with a single high safety in the deep middle of the field:
:format(webp):no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/16032917/Slide06.jpg)
It provides tight coverage on every receiver, allows the defense to add an additional player to the box to play the run, and if run properly can be good at taking away the easiest throws available to an offense (short and over the middle).