The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The electromagnetic spectrum extends from low frequencies (long-wavelength) used for modern radio communication to gamma radiation at the high-frequency (short-wavelength) end, thereby covering wavelengths from thousands of
kilometers down to a fraction of the size of an atom.
Electromagnetic radiation is classified by wavelength into radio wave, microwave, infrared, the visible region we perceive as light, ultraviolet, X-rays and gamma rays. The behavior of electromagnetic radiation depends on its wavelength.
Electromagnetic Spectrum Simulation
Simulator courtesy of University of Nebraska-Lincoln