I mean it kind of speaks for itself... You will have no access to the game if you're perm banned. If you'd like to appeal, the best of course of action would probably be to PM [ATA] Grant on here, as he's the only staff I see consistently online on the forums.
A Permanent Ban would mean you are blocked from accessing the game. A Permanent Silence means you are blocked from posting in public channels (Realm) as well as from sending mail to players outside of your clan.