Black body

A black body is an object that absorbs all electromagnetic radiation, or all colors of light. It emits electromagnetic black-body radiation at Planck scales.

A black hole absorbs all the light that hits its event horizon, reflecting nothing, making it almost an ideal black body.

The universe approximately a second after the Big Bang was a near-ideal black body at a temperature around 1010 K. The cosmic microwave background radiation (CMBR) observed today is a perfect black body.

Vantablack is a material that absorbs up to 99.965% of visible light. The name is a portmanteau of the acronym VANTA (vertically aligned nanotube arrays) and the color black.