An electromagnetic wave is a type of wave that consists of oscillating electric and magnetic fields, which travel through space. These waves do not require a medium, meaning they can move through a vacuum, such as outer space. Electromagnetic waves vary in wavelength and frequency, which determines their type, ranging from radio waves to gamma rays. The speed of electromagnetic waves in a vacuum is approximately 299,792 kilometers per second, commonly referred to as the speed of light. This property allows them to carry energy and information across vast distances. Everyday examples of electromagnetic waves include visible light, microwaves, and X-rays.