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Backlinks

  A   backlink   for a given   web resource   is a   link   from some other   website   (the referrer) to that web resource (the   referent ). [1]   A   web resource   may be (for example) a   website ,   web page , or   web directory . [1] A backlink is a  reference  comparable to a  citation . [2]  The quantity, quality, and relevance of backlinks for a  web page  are among the factors that search engines like  Google  evaluate in order to estimate how important the page is. [3] [4]   PageRank  calculates the score for each web page based on how all the web pages are connected among themselves, and is one of the variables that  Google Search  uses to determine how high a web page should go in  search results . [5]  This  weighting  of backlinks is analogous to  citation analysis  of books,  scholarly papers , and  academic journals . [1] [4]  A Topical PageRank has been researched and implemented as well, which gives more weight to backlinks coming from the page of a same topic as a