Analog is a method of representing information through an electrical signal that varies continuously.

What is an Analog Signal?

The term comes from the word "analog," which means "similar" or "corresponding." An analog audio signal is an electrical representation that is a direct analogy of the original sound wave. Just as the air pressure of a sound wave rises and falls smoothly and continuously, the voltage or current of the analog electrical signal also rises and falls continuously to mirror that wave.