Lens filters are accessories used in photography to modify the light entering a camera lens. They can enhance colors, reduce glare, or protect the lens from scratches and dust. Common types include polarizing filters, which reduce reflections, and neutral density filters, which allow for longer exposure times without overexposing the image. Using lens filters can improve the quality of photographs by controlling light and enhancing visual effects. They are typically made of glass or optical plastic and are available in various sizes to fit different lenses. Photographers often choose filters based on their specific needs and shooting conditions.