I have a TV. When I push volume up it goes up by 1, from 7 to 8. That is discrete.
I also have a very old radio that has a know and doesn’t hlknow settings like 7 or 8 or how to go up by 1. I turn it and the volume goes up or down by the amount I turn.
The latter is analog. There are infinitely many settings I can dial in.
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