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The nyquist shannon sampling theorem is the idea that as long as you capture 'samples' of signal (like the air pressure over time that is sound) faster that twice the period of the highest frequency component of the signal, all the information is captured and the aignal can be reproduced exactly (in theory).
maybe think of it like looking through a fence. As long as nothing on the other side of the fence is shorter than the spacing between posts, you can everything on the other side.
note that any file can be encoded as text with something like Base64
I love the fence analogy.