That's a BIG question. If you need a pretty detailed answer, then you should probably look through a MCSE prep book to understand it better - but here's a brief summary:
Windows 2000 server is just like Windows 2000 professional, except that it has a few other programs installed that allow it to act as a domain controller. A domain controller is a server that controls a domain - meaning if you set up a network, you can have a machine running windows 2000 server as your domain controller and have many client workstations that connect to the server. When a user logs in to the client workstation, they can log in to either the local computer only, or log in to the "domain" (domain is a network, to put it briefly - but there are lots of details you should look up). As a domain controller, all of the user accounts for the domain are stored on that machine, as well as the security policies for the entire domain. You can also install Exchange on the domain controller so that users on your domain can get email. Active directory is the Microsoft program that makes a Windows 2000 server a domain controller. When you install active directory (you install it by typing dcpromo in the Start-%26gt;Run box in Windows 2000 server), after running through the installation wizard, that machine will become a domain controller. But this whole concept is pretty complicated, so you'd be best reading up on it if it's something for a test or if you'll be doing it at work
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