Electromagnetic radiation is a type of energy that is commonly known as light. Detached from its source, it is transported by electromagnetic waves (or by their quanta, particles called photons) and propagates through space.
- Electromagnetic radiation includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays.
- Electromagnetic radiation is sometimes called EM radiation or electromagnetic radiant energy (EMR).
- All forms of electromagnetic radiation can be described in terms of both waves or particles.
- All forms of electromagnetic radiation travel at 299,792 kilometres per second in a vacuum.