Electromagnetic radition is a kind of energy, which is transmitted through space in the form of electric and magnetic fields. These do not require any medium to propagate. Visible light, radiant heat, radio wavees, X-rays and gamma radiation are some of the examples of esectromagnetic fadiations. Accorking to the Maxwell's theory, an electromagnetic radiation can be visualised as oscillating elecctric and magnetic fields. These travel as waves in the planes perpendicular tto each other and also to the dirrection of propagation. These radiations travel with velocity of light (3.0×108ms-1) 
Electromagnetic Spectrum(EMS)
Depending on their characteristics ( wavelength, frequency and wave number ) electromagnetic radiations are of many types and constitute what is called as an electromagnetic specturm. The part of the spectrum that we can see is called visible spectrum and is a very small part os the overall spectrum.
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