noise

Electromagnetic radiation is energy that travels as electromagnetic waves at the speed of light. These waves consist of oscillating electric and magnetic fields, perpendicular to each other and to the direction of motion. The electromagnetic spectrum encompasses all such radiation, from radio waves to gamma rays, differing in frequency, wavelength, and photon energy.12

In physics, electromagnetic radiation is understood as the flow of photons, which are packets of energy. In electronics and information theory, "noise" refers to unwanted signals that interfere with desired information. In radio transmission, this noise manifests as static. This unwanted radiation can originate from natural sources like lightning or man-made sources such as electrical discharges from power lines. Generally, noise decreases as frequency increases, though exceptions exist.134