system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is YouTube able to store so many videos?
gpt
on you computer you can put, let's say 1000 videos. Now if you buy some extra (external) harddrives you can make this 5000. But now you don't have any place on your pc to add new drives and a little tool for accessing the pc from a remote location. So you decide to remove everything from your computer except the harddrives with the movies and buy a new pc for accessing this one. Your old computer has now become a server.

Now get 100000 of these servers and connect them with each other (internet) and you can store many videos.