The electromagnetic spectrum is all possible frequencies and wavelengths of electromagnetic radiation, including visible light, radio waves, gamma rays etc., each having different properties and uses.
Related terms
Visible Spectrum: The portion of the electromagnetic spectrum that is visible to the human eye.
Infrared Waves: Part of the electromagnetic spectrum where wavelengths are longer than those of visible light, but shorter than radio waves.
Ultraviolet Rays: Part of the electromagnetic spectrum with wavelengths shorter than visible light but longer than X-rays.