A softbox is a rectangular fabric or plastic enclosure that fits over a light source, such as a strobe or speedlight, to soften and diffuse the harsh light it produces. The interior of a softbox is usually lined with a reflective material to help evenly distribute the light and avoid hot spots or harsh shadows. Softboxes are commonly used in portrait, product, and commercial photography to create soft, flattering light that enhances the subject without harsh shadows. They are versatile tools that can be adjusted to control the direction and quality of light, making them essential for achieving professional-looking photographs.