Federation is how two different instances are able to communicate within the Fediverse. The current worldwide email system is also based on the idea of federation, but it is not within the Fediverse. Hope that clears it up a bit!
Star Trek has a federation of Humans, Vulcans, and many other races. Their ships are still separate, but they work together.
The Fediverse has a federation of Startrek.Website, Lemmy.World, Sh.itjustwo.rks, etc.
Email has a federation of gmail.com, yahoo.com, microsoft.com, aol.com, every corporate.com, spectrum.net, tons and tons of small servers. This is probably the biggest federation. Many servers will choose to only federate with specific instances, or may explicitly defederate with a list of instances. If I stand up a private, home email on my own domain, there’s no guarantee that your work will accept my emails.
/m/fedia is sort of like announcements and discussion for fedia.io itself, not so much for general discussions. You can use Lemmy Explorer to find communities that might be more relevant, though unfortunately it doesn't currently seem to index mbin, just lemmy and some old kbin stuff.
moist.catsweat.com
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