Lenses are optical components used in cameras and other imaging devices to focus and direct light. They come in various types, including prime lenses, zoom lenses, and specialty lenses like macro and telephoto lenses. Lenses are made of multiple glass elements and are designed to achieve different focal lengths, apertures, and fields of view. The quality and characteristics of a lens significantly impact the image quality, making them crucial for photographers and videographers seeking to capture sharp and detailed images.