The material that absorbs all lights is called a black body. A black body is an idealized physical object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. This means that a black body appears completely black to an observer.

In reality, no material is a perfect black body, but there are some materials that come close. For example, carbon black and lampblack are both very good absorbers of light. However, even these materials reflect a small amount of light, so they are not perfect black bodies.

The concept of a black body is important in many areas of physics, such as thermodynamics, optics, and astrophysics. In thermodynamics, a black body is used as a reference point for measuring the emissivity of other objects. In optics, a black body is used to calibrate light meters and other optical instruments. In astrophysics, black bodies are used to model the emission spectra of stars and other celestial objects.