The PageRank is a set of criteria with which the search engine Google evaluates the link popularity of a page, i.e. the PageRank indicates how many links refer to a certain page. In addition, pages are also evaluated from where links lead to a corresponding web page. They are incorporated into the PageRank evaluation according to their quality. The evaluation of the PageRank is expressed by a number between 0 and 10. The higher the number, the better the PageRank evaluation.