Imagine walking into and out of a supermarket. If you did not purchase anything then the supermarket managers probably don't even know you were there. If you purchased something, the supermarket knows something was sold (they know a bit more if you use a membership card).
Visiting a website, you leave behind a significant amount of data, whether you buy something or not. The website knows every "aisle" you walked down, everything you touched and everything you put in your cart and then discarded. If you buy, the site manager knows where you live, where you came to the website from, which promotion you are responding to, how many times…
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