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I am slightly confused over the definitions of digital and analogue signals.

Is a digital signal discrete in time AND voltage or just discrete in voltage. For example, could a square wave that is continuous in time, but has discrete voltage levels be considered a digital signal?

Similarly could a sampled analogue signal (before passing into ADC) be considered analogue since it's voltage levels are continuous but it's time is discrete?

I would really appreciate any clarification anyone can give!

Many thanks

Paul Harris