electromagnetic radiation

any type of electromagnetic wave (waves composed of undulating electrical fields and magnetic fields)

Electromagnetic (EM) radiation is a self-propagating wave in space with electric and magnetic components. These components oscillate at right angles to each other and to the direction of propagation, and are in phase with each other. Electromagnetic radiation is classified into types according to the frequency of the wave: these types include, in order of increasing frequency, radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays.
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Low-energy radiation that comes from the interaction of electric and magnetic fields. Sources include power lines, electric appliances, radio waves, microwaves, and others. Also called electromagnetic field.

Radiation made up of oscillating electric and magnetic fields and propagated with the speed of light. Includes gamma radiation, X-rays, ultraviolet, visible, and infrared radiation, and radar and radio waves. [JP1]

A form of energy transportation which propagates through space as oscillating electric and magnetic disturbances. It always travels through a vacuum at the speed of light . Visible light, X-rays and microwaves are but three examples of electromagnetic radiation. Although it is usually thought of as a wave phenomena with wavelength and frequency, electromagnetic radiation can also be thought of as a massless particle, or packet of waves, known as a photon . This is because of the principle of wave-particle duality. Electromagnetic radiation is produced via interactions which occur through the force of electromagnetism . Classically it may be looked upon as originating when an electric charge accelerates. (see also synchrotron radiation).