Understanding Sites

Understanding Sites

Hi!
I want to understand using of Sites in SD.
I'm working in organisation, that have some sattelites.
So, most requests are coming from Head organisation (I'll name it A), and some from sattelites.
So I created Site for our sattelite. Do I need to do the same for the A?
For example in Configuration => Departments I can see Departments for "Default Settings" (Head) and for sattelite.
Does this correct?
Do I need to creat standalone Site for Head office?
Or may be there is a faq for my quiestions? =)









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