Analogue is used to describe something that changes value smoothly. It is the opposite of digital which describes something that changes in steps.
For example, there are two kinds of clock, an analogue clock that shows the time with a smoothly moving second hand and a digital clock showing time as a number that flips to a new number as time passes.
In elctronics and computing, analogue is used to describe a smoothly changing signal. For example, from a sensor.
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Click on this link: Analogue