Question

What is incandescence?

Answer 1

Incandescence is the emission of electromagnetic radiation (including visible light) from a hot body as a result of its temperature. Incandescence is the emission of light by a solid that has been heated until it glows, or radiates light. When an iron bar is heated to a very high temperature, it initially glows red, and then as its temperature rises it glows white.
It is a special case of thermal radiation.