Blackbody

A black body is a theoretical object that absorbs 100% of the radiation that strikes it. Consequently it reflects no radiation and appears perfectly black. However, in practice no material has been found to absorb all incoming radiation, other than carbon in its graphite form since it absorbs all but about 3%.
Black body is also an ideal emitter of radiation. At a particular temperature it would emit the maximum amount of energy possible for that temperature. This value is referred to as the black body radiation. The maximum wavelength emitted by a black body radiator is infinite. It also emits a definite amount of energy at each wavelength for a particular temperature, hence standard black body radiation curves can be drawn for each temperature, showing the energy radiated at each wavelength. All objects emit radiation above absolute zero.

Blackbody Example