Diffusers are devices used in lighting to soften and spread light evenly across a surface. They help reduce harsh shadows and glare, creating a more pleasant and natural illumination. Common materials for diffusers include frosted glass, plastic, or fabric, which allow light to pass through while scattering it. In photography and videography, diffusers are often used to enhance the quality of light from sources like flashlights or studio lights. By softening the light, they help achieve a more flattering look for subjects, making them essential tools for professionals and hobbyists alike.