[Vision]

OK, but don't others have to upload them somewhere?

[Sofa King]

It's a non-centralized system. The bittorrent client will connect you to a tracker, which can connect you to other people who have the same .torrent file running on their client. Like all P2P systems, this does rely on somebody else being out there to share the file. Bittorrent tends to work better with downloads that are currently popular. Getting older stuff with it can be a little hard.

To get the .torrent files themselves, you have to look on the internet. They have some search engines out there (like torrentspy), and some sites that host a lot of .torrent files.