Pirate Cove is a location of Freddy Fazbear's Pizza, seen on the security camera. It contains a purple, starry curtain and a sign saying "Sorry! Out of Order!".
Occasionally, when Foxy has left Pirate Cove, the sign will change to say "IT'S ME".This was known as a hallucination that Mike experiences
Foxy Spawn Point
The animatronic Foxy is stored there, possibly as a unused character in the shows. It is unknown what this area is actually used for, though the name implies that it could hold a separate, pirate-themed performance area away from the main stage.
Foxy slowly starts to come out behind the curtain if you don't check this scene for a while, or by checking it too much, eventually running to your room and killing you.