“Electromagnetic energy” is the name given to radiating, self-propagating, co-occurring electric and magnetic fields.
Electromagnetic energy is generated at the subatomic level; when atoms and their particles vibrate-something that occurs in any matter above absolute zero-the electrons in its “electron cloud” are oscillating (they accelerate and decelerate periodically), engendering electromagnetic energy.
The wave component of electromagnetic energy is accompanied by a particle component-or components-referred to as photons. Photons are the “quanta”-or smallest bits-of electromagnetic energy.
This video (6:03) explores