A Fresnel lens is a type of compact lens originally developed by Augustin-Jean Fresnel for use in lighthouses. It consists of a series of concentric rings, which allows it to focus light more efficiently than a traditional lens. This design reduces the amount of material needed while maintaining the ability to capture and direct light effectively. Fresnel lenses are used in various applications beyond lighthouses, including projectors, camera lenses, and solar energy systems. Their lightweight and thin profile make them ideal for situations where space and weight are critical, such as in aviation and automotive lighting.