Electromagnetic Waves

Electromagnetic waves are waves that consist of an electric and magnetic field.  These waves’ frequencies determine their type. Electromagnetic waves are put into different categories based on their wavelength. These are: (In order from longest to shortest in wavelength.) Radio, Microwave, Infrared, Visible Light, X-Rays, and Gamma Rays. The below illustration shows this concept.

Source: http://science.hq.nasa.gov/kids/imagers/ems/waves3.html