This document provides an overview of the electromagnetic spectrum. It discusses the different types of electromagnetic waves including gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. These waves are classified based on their wavelength and frequency, with gamma rays having the shortest wavelengths and highest frequencies, and radio waves having the longest wavelengths and lowest frequencies. A variety of uses are described for each type of electromagnetic wave, including uses in medicine, communications, heating, and vision.