Imagine if each part of a signal on a cable was someone talking. Higher bandwidth means more people talking. If you put everyone talking in a hallway it gets really noisy and you can’t hear anyone. A low quality cable is like a small hallway, very quickly you can’t make out the conversations because it’s too noisy.
A really high quality cable design allows everyone to talk (the multiple signals) without being too noisy to hear. A good one let’s people whisper and still be heard making it possible for even more people to talk.
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