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In 1996 Larry Page and Sergey Brin, the later founders of Google, worked at Stanford University on the question of how a new search engine could weigh for the www results. Their response was a new concept: the number and quality of the links pointing to a website should be a measure of their importance. If a page has many links from pages to which many links are pointing, the effect is increased. However, PageRank did not prove to be a reliable indicator of the quality or relevance of websites because it could not measure how well a page answered the question of the user or how useful it was for the user's concern.
The PageRank was independent of keywords. This certainly made a part of its appeal - a simple parameter that describes the visibility of a page independently of the context.
Many webmasters were ambitious about PageRank and tried to increase it by all means. Above the value displayed at the PageRank Check, other quality factors that contribute to the visibility of a page in the SERPs threatened to be overlooked. The algorithm proved to be in its original form as well as vulnerable to manipulation. Therefore the one-sided orientation at the PageRank was also very much criticized. The algorithm for the PageRank was constantly optimized by Google to make it more meaningful and to prevent manipulation, and the purchase of backlinks, later also the sale in the Google quality guidelines was prohibited.
However, the sudden fall or loss of PageRank meant that a so-called abstraction could also be seen immediately. A sudden kink in PR history almost always meant that Google had manually worsened the page's visibility in response to unfair behavior.
Until autumn 2013, SEOs waited impatiently for the so-called PR update, ie the publication of PageRank by Google. Because it was differentiated between the public (which could be queried with PageRank Check Toolbars or similar) and the so-called internal PageRank. PR update therefore only indicated the publication of the values. The distances between the publications varied widely, they could be a few weeks or a half a year. The relevance of PageRank as a SEO indicator was heavily debated in the SEO community, and it was always declared dead or irrelevant - especially when PR updates brought a lot of time into the country where a PageRank check did not show any change. In December 2013, Google announced that it would no longer publish PageRank. Is he dead with him? Not quite: The algorithm is still used and optimized by Google and is now part of the so-called Hummingbird algorithm. As (some would say: deceptive) clear SEO metric, which is accessible to everyone, the PageRank is thus really history.
Although the PageRank is no longer published, a PageRank Check can still provide interesting information. A page that had a PR of more than 0 at the end of 2013, at least at that time already existed and had a little visibility on Google. And a page, which at that time was a good value, with a certain probability still offers valuable backlinks.