Stereophonic sound system is electronic equipment that reproduces lifelike sound, especially music, that seems to have depth and to come from many directions. Such a system is often called a stereo system or simply a stereo. Stereophonic sound requires the distribution of sound signals through at least two separate channels. The resulting sound provides the illusion of the sound effects of musicians spread out on a stage. Most stereo systems maintain the greatest possible fidelity, or faithfulness, to a sound source while producing little distortion or background noise. Such systems are sometimes called high-fidelity systems.