represent the total number of hits (requests) that actually resulted
in something being sent back to the user. Not all hits will
send data, such as 404-Not Found requests and requests for pages that
are already in the browsers cache.
By looking at the difference between hits and files, you can get a
rough indication of repeat visitors, as the greater the difference
between the two, the more people are requesting pages they already
have cached (have viewed already).