A hydrofoil is a type of boat or watercraft that uses wing-like structures, called foils, to lift the hull above the water's surface as it gains speed. This design reduces drag and allows the vessel to glide smoothly over the water, improving efficiency and speed. Hydrofoils can be found in various types of watercraft, including sailboats, ferries, and racing boats. Hydrofoils operate based on the principles of hydrodynamics, where the shape of the foils generates lift as water flows over them. This technology has been used for decades and is popular in competitive sports, such as sailing and kiteboarding, due to its ability to enhance performance and provide a unique riding experience.