Electromagnetic waves are transversal waves that can propagate through a vacuum. They consist of two fields—an electric field and a magnetic field—that are perpendicular to one another. The radiation travels toward the direction of their cross-product. Electromagnetic waves are placed on a spectrum based on their frequency or wavelength. These are gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves consecutively. Electromagnetic waves have several properties. They can experience reflection, refraction, diffraction, polarization, dispersion, interference, and absorption.
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