system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Bandwidth - How does a satellite send down hundreds of channels of high definition content to televisions all over the country, but my 1MBPS in the connection gets bogged down by five smartphones?

Question from my grandad to his 'techy' kids at Christmas.
gpt
Think of broadcasting television channels like a movie theater. Each individual theater can display a movie to to huge numbers of people, only limited by how many seats there are and how bright the screen is. If the screen was bright enough and there were enough seats, everyone on earth could watch a movie off that one screen.

But when it comes to sending and receiving data to and from a single person, it's less like a movie and more like a phone call. That single satellite up in space can only switch back and forth between separate phone calls so quickly before it's overloaded.

So in other words broadcasting is easy. Individual communication is hard.