Ship propulsion refers to the methods used to move a ship through water. The most common types of propulsion systems include diesel engines, gas turbines, and electric motors. These systems convert fuel or energy into mechanical power, which turns the ship's propeller or drives water jets to create thrust. In addition to traditional systems, some ships use nuclear power for propulsion, especially in military vessels and icebreakers. Advances in technology have also led to the development of hybrid systems that combine different power sources, improving efficiency and reducing environmental impact while navigating the seas.