There is a difference between the terms Unique Visitor and Visitor. Unique Visitors are measured according to their unique IP addresses, which are like online fingerprints, and unique visitors are counted only once no matter how many times they visit the site. A Visitor is measured according the number of times your website is accessed.
Site Stats on the Side Toolbar displays multiple options for viewing assorted statistics about your website.
Dashboard shows the Visitor Site Summary, Top 20 Pages Today, Site Usage Summary and, Visitor Profile.
Top Pages shows the Top 200 Pages. Viewed via date(s) specified and sorted by the Page Views count.
Referrers shows the Top Referring Domains and Top Referring URLs for your website.
Geography shows the known locations of visitors.
Technology shows the browser type and version, as well as the operating system of site visitors.
Usage shows a general summary of your site statistics for the current day, or a specified date range.