Question: What is meant by electromagnetic radiation? How can light be a form of radiation?

Urslaan Chohan answered on 9 Jun 2018:

Light is made up of waves and particles (in fact both at the same time called wave-particle duality!), known as photons. Photons are small packets of energy, a bit like a box contains objects. As long as something has photons in it, it’s radiating, since that’s what radiation actually is – a form of energy. Electromagnetic radiation is just a term to describe these photon based radiation – such as visual light, ultra-violet, radio wave, etc. These come together on the electromagnetic spectrum.