A lens hood is an accessory used in photography to block stray light from entering the lens, which can cause unwanted glare and lens flare. It is typically made of plastic or metal and is designed to fit specific lenses. By preventing light from hitting the lens at extreme angles, a lens hood helps improve image contrast and color saturation. In addition to reducing glare, lens hoods also provide physical protection for the lens. They can shield the lens from accidental bumps, scratches, and even raindrops. Many photographers consider using a lens hood essential for achieving the best possible image quality with their cameras.