Google uses the PageRank algorithm to rank websites in their search engine results. It is not the only algorithm used for ordering search engine results, but it is the first that was used by Google.
PageRank is a way of measuring the importance of website pages by counting the number and quality of links to a page to determine a rough estimate of how important the website is.
The underlying assumption is that more important websites are likely to receive more links from other websites.
Simply copy the html code below and paste it in any webpage you want to display its pagerank.