system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how does sound travel through a cable? this is absolute witchcraft to me.
gpt
Information can be transferred as long as the sender and receiver agree what certain symbols/actions mean. If someone read aloud a letter or email, does that mean the sound was transferred in the letter? It simply means we have a system that most of us agree on to convert certain markings on a paper into words. We then agree that words should be pronounced in a certain way to form speech. 

It is pretty much the same for electronic communications of any form whether that information are sounds, videos, texts etc. There are standards that the makers of equipment agree to that certain electrical signals should be interpreted in certain ways. And we also design equipment that converts these signals from one way to another (like a picture on a screen or sound out of a speaker). It isn't magical just like reading aloud words from a book isn't magical.