Print server vs. printer sharing on Windows Server

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http://serverfault.com – On my new Windows Server 2012 I've installed a printer and shared it via the Sharing tab: I'm not in a Windows domain (just a regular work group) and printing works fine. Now there's also the "Print and Ducment Services" role - which includes the "Print Server" role service. Why would I need this role? Or is this just for "advanced" printer deployment? (HowTos)