Banners in websites, what's the logic behind?

Banners in websites, what's the logic behind? How do these websites and ecommerce companies manage banner/links advertisements. How do they hanlde banner statistics? Do they have an external repository for counting number of times an advertisement was shown?

Ok, im a customer who signed up with you for having my product advertised on your site? What's the agreement behind? Is it that simple as we have an agreement my banner will be shown 1000 times in week? How can can I be so sure?

I'll update this entry once i got accurate information. I have a similiar post on our local developer forum here in the philippines.

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