Accessing VCenter from the Internet side

Using VCenter 6.5 Appliance on ESXi 6.5. I would like to access the Appliance over the Internet. However, I read several posts saying that this is impossible by design.

Sorry if this is a silly newbie question, but then what is the use of a FQDN if not for that? And how does VCenter "know" that it is being used over the Internet? (assuming the proper port forwarding on the Router).