A UV filter is a transparent optical filter that allows visible light to pass through while blocking ultraviolet (UV) light. It is commonly used in photography to protect camera lenses from scratches and dust, as well as to reduce the effects of UV light, which can cause haziness in outdoor images. In addition to photography, UV filters are also used in various applications, including sunglasses and skincare products, to help protect the eyes and skin from harmful UV radiation. These filters can enhance image clarity and color balance, making them a valuable tool for both amateur and professional photographers.