The ready room is a space provided for the commanding officer of a starship. The ready room is either adjacent to or near the ship's bridge, and provides a private space near the bridge for the Captain of a ship in addition to his or her regular quarters.
Most ready rooms consist of a desk, seating for guests, a replicator and decorations representing the Captain's interests.
On Galaxy-class starships the Captain's ready room featured a sofa that could be converted into a bed for the commanding officer to use should they feel the need to sleep near the bridge. In addition to the ready room adjacent to the main bridge, a smaller Captain's ready room was placed adjacent to the battle bridge, giving the Captain an office space to use when the saucer and battle sections were separated. (TNG episode: "Encounter at Farpoint")
Notable ready rooms
Captain Data's ready room aboard the USS Enterprise-E featured decorations that included a model of a Galaxy-class starship and Data's own large painting of Spot, his beloved pet cat. (ST - Countdown comic: "Countdown, Number Two")