Can somebody explain the difference between Hosts, Hits, and Visitors on the report?

I am confused as to what "Hits" and "Visitors" mean for each "Host" in the report. For example, I have one Host with 39 Hits and 14 Visitors. I have another host with 2 Hits and 2 Visitors.

My understanding of "Hits" were that they include all the resources on a page, like any css, images, or JavaScript files on the server. So if my page has 1 html file and 2 images, then each "Visitor" should have 3 "hits". Is this correct? I am confused of how some visitors get more "hits" than others for the same web page on my report.
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