Diamond Pattern Hollow Core MDF Door Slab for Pocket DoorA pocket door is a door that you can hide when you don't need it. It slides inside the wall and disappears when open. A pocket door differs from other sliding doors or barn doors,it remains visible at all time. Pocket doors work well in spaces where clearance is a concern. If you have a narrow hallway that doesn't allow for a standard door to swing open without hitting another wall or furniture, a pocket door would be a perfect solution. Pocket doors