I love how interconnected the whole Fediverse is. Spread the word and make Europe use Mastodon and Lemmy!

Different websites running the same program that work with each other. Lemmy is the program running on lemmy.world, where you and I both have accounts. There are other Lemmy servers that lemmy.world is compatible with. In the comments of this post you can see some user names that end with other sites in this format: name@other.lemmysite, they have accounts on different websites that also run Lemmy.
There are other programs that work this way too, like Mastodon and Pixelfed. All these websites running all these programs are "the fediverse"