Hits
Any request made to the server which is logged, is considered a 'hit'. Each valid line in the server log is counted as a hit. This number represents the total number of requests that were made to the server during the specified report period.

Files
Any request made to the server which actually resulted in something being sent back to the user is counted as a file. Not all hits will send data, such as 404 Not Found requests and requests for pages that are already in the browser's cache.

Pages
Any request made to the server for an actual page, and not all of the individual items that make it up (such as images and audio clips). This can also be termed as page views or page impressions. A page is deemed to be any file with one of the following extensions: .htm, .html, .cgi, .php, .pl, .shtml, .asp.

Visits
A visits occurs when a remote site (IP address) requests a page on the server for the first time. As long as the same site keeps making requests within the timeout period of 30 minutes they will all be considered part of the same Visit. If the site makes a request to your site, and the length of time since the last request is greater than the timeout period of 30 minutes, a new Visit is started and counted, and the sequence repeats.

KBytes
This value shows the amount of data that was transfered between the server and the remote machine, based on the information found in the server log.

Sites
Each request made to the server comes from a unique site, which can be determined by a name or an IP address. The value shows how many unique IP addresses made requests to the server during the reporting time period.