The electromagnetic spectrum is the complete range of electromagnetic radiation, which includes all forms of energy that travel as waves or particles through space. This spectrum encompasses a wide range of wavelengths and frequencies, extending from radio waves with the longest wavelengths and lowest frequencies, to gamma rays with the shortest wavelengths and highest frequencies. Within the electromagnetic spectrum, there are various regions or portions, each with its own distinct characteristics and applications. These regions include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Each region is defined by its specific range of wavelengths and frequencies.