Firstly, it is important to understand that both digital and analogue signals get weaker as they travel, so they need to be amplified along their route. Also, both signals pick up noise/interference from electrical disturbances or other signals.
However, when you amplify analogue signal, the nose it has picked up is amplified too, this worsens the quality of the signal. With digital signal, the noise is not amplified meaning the signal quality remains high.
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