A galley ship is a type of vessel primarily propelled by oars, often supplemented by sails. These ships were commonly used in ancient and medieval times for trade, warfare, and exploration. The design typically features a long, narrow hull, allowing for speed and maneuverability in various water conditions. Galleys were manned by rowers, often slaves or convicts, who powered the ship through coordinated strokes. Notable examples include the Greek trireme and the Roman bireme, which played significant roles in naval battles. Galleys were especially effective in the Mediterranean Sea, where their agility gave them an advantage over larger ships.