Boat propulsion refers to the methods used to move a boat through water. The most common types include outboard motors, inboard engines, and sails. Outboard motors are mounted on the boat's exterior and provide thrust through a propeller, while inboard engines are housed within the boat and often drive a shaft connected to a propeller. Sailing relies on wind to propel the boat, using sails that catch the wind and convert its energy into forward motion. Other propulsion methods include human power, such as rowing, and electric motors, which are becoming increasingly popular for their efficiency and environmental benefits.