A deck is a permanent covering over a compartment or a hull of a ship. On a boat or ship, the primary or upper deck is the horizontal structure that forms the "roof" of the hull, strengthening it and serving as the primary working surface. Vessels often have more than one level both within the hull and in the superstructure above the primary deck, similar to the floors of a multi-storey building, that are also referred to as...

Deck (ship) Decks are the main horizontal parts of a ship's structure. The crew stand and walk on the deck. A deck is the floor of a boat or ship, but open boats only have floorboards.