How does message loops in erlang work, are they sync when it comes to processing messages?

As far as I understand, the loop will start by "receive"ing a message and then perform something and hit another iteration of the loop.

So that has to be sync? right?

If multiple clients send messages to the same message loop, then all those messages are queued and performed one after another, or?

To process multiple messages in parallell, you would have to spawn multiple message loops in different processes, right?

Or did I misunderstand all of it?