Black body radiation refers to the electromagnetic radiation emitted by an idealized object, known as a black body, that absorbs all incoming radiation without reflecting any. When heated, a black body emits radiation across a spectrum of wavelengths, with the intensity and color depending on its temperature. This phenomenon is crucial in understanding thermal radiation and energy transfer. The concept of black body radiation led to significant developments in physics, including Max Planck's formulation of quantum theory. Planck's law describes how the intensity of radiation emitted by a black body varies with temperature and wavelength, providing a foundation for modern physics and our understanding of light.