The quarterdeck is a raised deck behind the main mast of a sailing ship. Traditionally it was where the captain commanded his vessel and where the ship's colours were kept. This led to its use as the
Raised quarterdeck of an 18th-century frigate, between the main mast and the even higher poop deck at the stern.
Before helicopter decks became common, warships such as the Rothesay class often had a deck at the stern used for secondary armament.
Seaplanes were often operated from the quarterdeck of battleships, as here on USS Colorado
Quarterdeck of a Japanese warship. Note the watchstanders in uniform, the wooden plaque, and the proximity to the accommodation ladder.
In naval architecture, a poop deck is a deck that forms the roof of a cabin built in the rear, or stern, part of the superstructure of a ship.
Quarterdeck
…Raised quarterdeck of an 18th-century frigate, between the main mast and the even higher poop deck at the stern. Before helicopter decks became common, warships such as the Rothesay class often had a deck at the stern used for secondary armament…
Poop deck of a model of the Soleil-Royal, as seen from the forecastle