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Black body is the hypothetical body which absorbs all the radiation incident upon it. In practice it is not in existance.
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Blackboard is a surface that absorbs all radiant energy falling on it. The term arises because incident visible light will be absorbed rather than reflected, and therefore the surface will appear black. The concept of such a perfect absorber of energy is extremely useful in the study of radiation phenomena.
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Black body absorbs all the radiation that incident on it.

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Black body is the hypothetical body which absorbs all the radiation incident upon it.
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black body is an hypothetical body which is determine in following manner 1 a black body absorbed all incident radiation regardless of wavelength and direction that is it is perfect absorber 2 radiation emitted by a black body is the function of wavelength and temp. It is independent on direction that is black body is perfect diffuse emitter 3 for a prescribed temp and wavelength no surface can emitt more energy than black body if all 3 condition are satisfy than body is said to be black body
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The body which absorbs all the radiation falls on it is called as a black body. In practice it is not in existance. Generally for black body absorbity is equal to emmisivity.

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a hypothetical perfect absorber and radiator of energy, with no reflecting power.

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A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

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A body is called the pure black body if it absorbs all the radiations coming to it.

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