On lemmy, a ban can be a few different things:

1. Banned from the instance your account is on. This means you have to make a new account, usually on a different instance.
2. Banned from a different instance than the one your account is on. This means you get banned from communities you’ve participated in on that instance, and that instance will no longer federate with your account. You might participate in new communities on that instance, and people not on that will see your comments, but people on the instance you were banned from won’t see them. From the perspective of that instance you don’t exist anymore.
3. Not banned from any instances, but banned from individual communities. You can’t post in that specific community but can still interact with the instance that community is on.

Like someone else said, clear as mud, lol.