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Hits = requests to the server, so for example, if you home page is just text, that's one hit. If you have an image plus text, that's 2 hits. Four images plus text is 5 hits. And so on. It's practically meaningless, unless you put a "hit counter" on the page that shows all of these so people think your site gets a lot of traffic.
Visits = each time someone comes to your site, it counts as a visit. If they come twice, that's 2 visits.
Pages = the number of pages that are viewed
Files = I suppose this refers to downloadable files that you might have available as a link (eg, to a PDF or mp3 or other media file)
Unique is what you really want to know about. I'm unclear on what "unique sites" means. Referrers refers to the page that has a link to your site (like if DU had a link to your site and people clicked on it). User agents refers to browser info of the visitor. The most direct way to discern unique visitors is via visitor IP, although many people use proxy agents which would appear as the same IP. That's why they offer those other pieces of info, to help you determine (eg, if you get two different user agents from the same IP, you could consider those 2 unique visitors)
Hope this helps a little. I'm sure someone with more specific help will come by.
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