Public room
Definition
A public room is the open live broadcast. Anyone logged in (and often anyone not logged in) can watch. Chat is usually visible to the whole room. Tips show up on screen. This is the default state of most amateur cam sites.
What is free, what is not
Watching is typically free. Talking may be free or may need a minimum token balance. Anything on the tip menu costs tokens. A jump to private costs more.
Assume logs exist. Do not put a phone number in public chat. Getting started walks through a first session.