Hydrofoils are wing-like structures attached to the hull of a boat that lift the vessel above the water's surface as it gains speed. This design reduces drag and allows for faster travel, making hydrofoils popular in various watercraft, including ferries and racing boats. When a hydrofoil is submerged, it generates lift due to the flow of water over its shape, similar to how airplane wings work in the air. This technology enhances efficiency and stability, providing a smoother ride even in choppy conditions, which is beneficial for both recreational and commercial use.