Electromagnetic radiation is a fundamental physical phenomenon consisting of oscillating electric and magnetic fields that propagate outward at the speed of light. It represents energy that does not require a medium for transmission, allowing it to travel through a vacuum. The full spectrum of electromagnetic radiation spans various wavelengths and frequencies, each corresponding to distinct types of energy. This spectrum includes radio waves, which have the longest wavelengths and lowest frequencies, progressing through microwaves and infrared radiation, before passing through the visible light spectrum. Beyond visible light are ultraviolet, X-rays, and gamma rays, which possess increasingly high frequencies and short wavelengths, often carrying higher levels of energy. The relationship between a wave's energy, frequency, and wavelength is fundamental to understanding how these different forms of radiation interact with matter.