The too are available in a location that only they are informed about. Remember that hits, requests, and visitors are all very different. A visitor is a person that accesses with site in some way. When someone accesses a html type page, this is considered a hit. Requests are everything sent to the visitor and includes all graphics, backgrounds, and other related features.
Visitors are hard to define.
The same person can come back to your site many times and may be considered a different visitor. An access from a particular ISP could be the same person, or someone else, irrespective of whether the name they access under is the same or different. Statistical programs take these features into account and give you meaningful data. For example, suppose you have told everyone about your web site and thousands of people are visiting the front page everyday. If they never go past the front page, all that advertising is being wasted, The page may be causing them to leave your site and never see all the features you pace on your web site for them.