An electrical signal that varies continuously. Comes from the word ‘analogous,’ which means ‘similar to.’ All early AV recordings were analog.
Analog is the traditional method of modulating signals so that they can carry information. AM(Amplitude Modulation) and FM(Frequency Modulation) are the two most common methods of analog modulation. A digital signal by contrast, varies in discreet steps. Analog controls are dials, knobs, and similar mechanisms that you find on monitors and other devices.