Electromagnetic radiation is a form of energy that travels through space in waves. It includes a wide range of wavelengths and frequencies, which determine its properties and uses. The spectrum of electromagnetic radiation includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each type has different applications, from communication to medical imaging. This radiation is produced by the movement of charged particles, such as electrons. It can travel through a vacuum, meaning it does not require a medium like air or water. The speed of electromagnetic radiation in a vacuum is approximately 299,792 kilometers per second (or about 186,282 miles per second).