“More!!” -Kylo Ren

Ok ok… So me using Lemmy.world is a specific instance of Lemmy, so it’s almost like its own server? And other instances (maybe lemmy.unitiedstates?) is its own federated instance likely related to just U.S. posts and it can communicate with other instances? Do de-federated instances have no other communication with instances?

Apologies if these are silly, I feel like a dum dum because everyone else seems to grasp this except me.

Newbie question here… What’s the difference between federated and de-federated?