A Graduated Neutral Density (GND) filter is a photography tool that helps balance exposure between bright and dark areas in a scene. It is typically darker at the top and gradually becomes clear towards the bottom, allowing photographers to reduce the brightness of the sky while keeping the foreground properly exposed. This is especially useful in landscape photography where there is a significant difference in light levels. GND filters come in various strengths and sizes, and they can be made of glass or resin. Photographers can use them to achieve more natural-looking images without relying heavily on post-processing. By controlling light more effectively, GND filters enhance the overall quality of the photograph.