system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can cable send hundreds of HD channels at the same time but my internet is slow?

Basically, the cable coming into our house gives us access to hundreds of HD channels (that's a lot of data)
gpt
It's the difference between using a megaphone to talk to 100 people, and using 100 telephones to talk to 100 people. There is no two-way communication with cable (TV at least), and you are only handling 1 signal instead of a separate signal for each person.