Eli5: What is the real difference between analog and digital?

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I tried looking it up, and my brain just wasn’t making sense of it, but I haven’t had coffee yet so.

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Analog uses continous signals, while digital uses discrete signals. Continious values are like waves in physics, so they have infinite resolution (possible values within some range) at cost of being imprecise (there’s always some error as with quantum systems). Digital ones, on the other hand, have limited set of values, but do not suffer from measurement errors. Our world is actually analog, so digital circuits are just kinda built on top of that like normal physics works on top of quantum theory.

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