Well, to sum it up, it's a bunch of servers acting together like a big decentralised social media. They connect thanks to activitypub, and it's quite amazing.

Here's a good illustration, i think

For exemple, one can see your profile here from lemmy: lemmy.ml/u/camille_jamal but also from mastodon: https://mas.to/@Camille_Jamal@lemmy.ml/ And even from misskey! https://misskey.io/@camille_jamal@lemmy.ml

Even though thoses three fedi services have very differents interfaces and ways of working, they can communicate thanks to activitypub.

If you check c/fediverse@lemmy.world, you'll see a bunch of useful links about the fediverse in their description.

I see you're banned, hope you'll still get my message, and that your ban is temporary... anyway have a nice day.