The AWStats program is included with each web hosting account and provides a good overview of your sites' visitors.

Some of the useful information provided:
Number of site visitors
How they found your site
How long they stayed on your site
What pages they entered/exited from
Keyword phrases used
Search engines they found your site on

Unique Visitor:  A unique visitor is a one computer that has made at least 1 hit on 1 page of your web site during the current period shown by the report. If a visitor makes several visits during this period, it is counted only once. So I can visit the site 5 different times on one day from one computer and be counted as one unique visitor.

Hits:  A common misconception is that this is how many visitors you had. Hits are any files requested from the server. This includes the page itself and every image on it. Each "item" that the server displays counts as one hit.

   
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