WCF service hosted in IIS

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Hi All,

based on server2003,

What's the meaning of "BUILD">"Publis h WEB SITE" in visual studio 2008 menu
when I create WCF service.

what's the difference between "BUILD WEB SITE" and "Publish WEB SITE"?

When I create the WCF service hosted in IIS, Do I need to publish?

Is it all I need that just make virtual directory on ths iis, and open the
website in the vs2008, coding and saving?

Please, advice me.
Thanks,
soworl