I don't understand how does postfix work with a POP server

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I don't understand how does postfix work with a...
\ Jordi Cabré (15 May 2007)
. \ (Wietse Venema) (15 May 2007)

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Subject:	I don't understand how does postfix work with a POP server
Group:	Postfix-users
From:	Jordi Cabré
Date:	15 May 2007

Questions:

* When Postfix determine that a mail is for it, where is the message
saved?
* How does a POP server comunicate with SMTP server in order to
obtain the messages from users? POP user are equal to SMTP users?

Thanks in advance.

--JORDI--