Visits
Number of active visits to the web site. Every visit from a visitor is counted, even if the same visitor came to the web site multiple times
A visit is a series of page views, beginning when a visitor’s browser requests the first page from the server, and ending when the visitor leaves the site or remains idle beyond the idle-time limit.
Visitors
A person at a computer using a browser to visit the web site. A visitor may make more than one visit during a given time period. Since a person may use different computers or even use different browsers on the same computer, it is possible for him/her to appear as more than one visitor
Page views
A hit to any file classified as a page. The page and its embedded files counts as a single page view.
Hits
A request for a file by a browser. Since "file" refers to images, styles, and many other elements besides .html pages, a single web site page view can involve dozens of hits. Because the number of hits is so heavily influenced by the complexity of a page, hits are a far less helpful measure of site traffic than visits or visitors.