Ship propulsion refers to the methods and systems used to move a ship through water. The most common type of propulsion is through engines that convert fuel into mechanical energy, which then drives the ship's propeller. This process allows the ship to navigate efficiently across oceans and rivers. Another method of propulsion is sail power, where wind is harnessed to move the ship. Modern ships may also use diesel engines, gas turbines, or even electric motors for propulsion. Each system has its advantages and is chosen based on the ship's design, purpose, and operational environment.