If Lemmy and Mastodon continues to get popular, we will eventually get Instance wars.
@fluke in case this is not a joke, yes instances host communities, but the lemmy.world is just a domain name. Federation just means lemmy.world and another server/instance such as geddit.social can share and exchange communities, comments, and threads they host with each other. I'd be happy to answer additional questions you might have, but I'm not as expert as I don't share links in that format much.
