PageRank is a patented method to provide numerical importance of each item in a set of documents displayed as links on the Internet. PageRank on Google is a note for each website on the Internet. Google works as a unique combination of advanced hardware and software algorithms. Google’s search speed is attributed on the efficiency of their search algorithm and on the network of thousands of computers put to work as a super fast search engine.
PageRank is a system of classification of web pages developed by Google founders Larry Page and Sergey Brin.
PageRank relies on the unique nature of the Internet to use the vast network of connections (links) as an indicator of the value of individual websites. In essence, Google interprets a link from page A to page B as a vote on page A for page B. But Google analyzes not only the volume of links, but the page where the link is posted. The links posted on pages that are important have more weight and help others become important pages too. Important and quality sites receive a higher PageRank and Google stores this information for these pages in search activities, ranking them higher among other sites.
Of course, important pages mean nothing if are not meeting our search criteria. So, Google combines PageRank with sophisticated matching techniques to find textual and important websites on the criteria mentioned above, but also to meet our search criteria. Google examines all aspects of its content and content pages on sites that bind a match to determine the best possible search criteria.
Google Toolbar PageRank displays a value between 0 and 10 for a site. It is updated every 3 months (in most of the cases), so the results displayed in the Toolbar are historical and not in real time. Google Toolbar can be easily fooled by a fake PageRank (by forwarding – spoofing).
In efforts to optimize sites for search engines (SEO – Search Engine Optimization), some sites take advantage of a high PageRank by selling links. Because links received from a site with a higher PageRank has a great importance, it may be a viable marketing strategy to increase traffic and popularity of your site. Tricking the system by such methods affect the quality of search and because of this, Google does not agree with this (manipulating) method and those who sell links risk declassification or total ignorance by search engines.
Proposal of rel = “nofollow” by Google
In 2005, Google has implemented a new value, the rel = “nofollow” attribute to HTML for webmasters or bloggers, that can put this value to links that Google will not take into account in calculating PageRank. This new value has been implemented to combat the phenomenon of SPAM.
For example, in the past, a webmaster could increase links to their websites by posting on forums with high PageRank value, to artificially increase their value. But now this method does not work anymore, because many forums assign the “nofollow” value to any link from a post.
Google PageRank is calculatet every 3-4 months, but this is not a fixed term.