PageRank
Also called: PR or link authority
PageRank is part of Google's search engine algorithm. 'Page' refers to Larry Page, the creator of the PageRank algorithm and, along with Sergei Brin, founder of Google. This algorithm involves giving Web pages a rating from 0 to 10 based on the number of external links. The more links, the higher a page's PageRank.
Here, links from pages that themselves have a high PageRank weigh more heavily than from pages with a low PageRank. The principle of PageRank is inspired by scientific publications: the authority of articles and scientists depends on the authority of scientific titles and vice versa. Another word for PageRank is link popularity.
Expanding the number of links(link building) is an important part of search engine optimization.
In the early days, PageRank was the biggest factor in ranking search results. Today, the influence is a lot smaller and more attention is paid to the relevance and context of links. PageRank ratings of Web sites circulating on the Web come from Google's periodic public export of PageRank, aka "Toolbar PR. In real life, Google calculates with a 'Live PR,' which is continuously recalculated, has multiple decimal places and is not public.
