page loads vs. unique visitors

I'm a little bit confused , can anyone explain this?

Page Load - The number of times your page has been visited.

Unique Visitor - Based purely on a cookie, this is the total of the
returning visitors and first time visitors - all your visitors

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So if I have a web site "with more pages" of course than where to look how
many visitors a day I have, page load or unique visitors?

Thanks

It is *possible* to track unique sessions.
Each time a visitor enters the site a session
can be started and recorded, that expires the moment that user
follows a link to a page outside your domain.

Html pages generated by java servlets, php, ruby and/or
mod perl, etc......can all handle session tracking, via
several methods (cookies, url rewriting, special
get parameters, etc).

So, iff you already have a dynamically generated site,
adding your own home rolled session tracking would
not be such a major undertaking. If you have static
html pages I doubt you could track sessions, not without
controlling the webserver....or working with a webserver
system with something like Urchin installed, which (I think)
combines log file analysis with server-side session tracking.