If analogue waves are similar frequency, they can interfere with each other and lose signal quality. However, with digital signal it is much easier to tell the two waves apart, meaning more information can be transmitted along the same channel.
Furthermore, there is a process called quantisation. This is the rounding of multiple values to a smaller set. By doing this, more information can be packed into the same amount of space. As digital signals only have two values, not much information (if any) is lost due to quantisation. However, a lot can be lost when analogue is quantised.
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