The original idea behind Google's ranking algorithm, or also known as PageRank or the democratic rank, from the name of its creator, Google's cofounder Larry Page, was to analyze the hyperlink structure of the internet in order to undercover implicit votes from internet users. The billion-dollar assumption, at the time, was that anybody who posts a link to some page, is actually voting for that page.

So what Google did was to crawl the whole web and count the votes (links) each page had. The more votes a page had, the more relevant it became for the users. Another important twist, for that matter, is that not all votes were equal. Some votes were more relevant than others.
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