Xtallll , 11 months ago

Every community lives on its instance(server).

When you browse your Local feed it only shows communities that live on the same instance you made your account on.

For federation: When you want to see a community on a different instance your instance will download a copy of the community from it’s home instance. Then if you make a change, like an upvote or a comment your community makes the change on its local copy, then it sends a copy of the change to the original community.

When two instances are defederated they stop sending or receiving updates from each others communities.