A UV filter is a type of filter that is designed to block ultraviolet (UV) light from entering the camera lens. While modern digital camera sensors are designed to be less susceptible to UV light than older film cameras, UV filters can still provide several benefits to photographers. 

Firstly, UV filters can help to reduce haze and atmospheric distortion, particularly in outdoor scenes where there is a lot of UV light present. This can result in images that are sharper, more detailed, and more visually appealing. 

Secondly, UV filters can help to protect the front element of the camera lens from scratches, dust, and other types of damage. This can be particularly important for photographers who work in harsh or dusty environments, where the lens may be exposed to a lot of wear and tear. Additionally, UV filters are easy to clean and replace, making them a cost-effective way to protect expensive camera lenses from damage. 

Overall, while the benefits of UV filters may not be immediately noticeable in every situation, they can be an essential accessory for photographers who want to protect their equipment and achieve the best possible image quality.