PageRank is a link analysis algorithm, named after Larry Page,[1] used by the Google Internet search engine that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. The algorithm may be applied to any collection of entities with reciprocal quotations and references. The numerical weight that it assigns to any given element E is also called the PageRank of E and denoted by PR(E).
Mathematical PageRanks (out of 100) for a simple network (PageRanks reported by Google are rescaled logarithmically). Page C has a higher PageRank than Page E, even though it has fewer links to it; the link it has is of a much higher value. A web surfer who chooses a random link on every page (but with 15% likelihood jumps to a random page on the whole web) is going to be on Page E for 8.1% of the time. (The 15% likelihood of jumping to an arbitrary page corresponds to a damping factor of 85%.) Without damping, all web surfers would eventually end up on Pages A, B, or C, and all other pages would have PageRank zero. Page A is assumed to link to all pages in the web, because it has no outgoing links.
Algorithm PageRank is a probability distribution used to represent the likelihood that a person randomly clicking on links will arrive at any particular page. PageRank can be calculated for collections of documents of any size. It is assumed in several research papers that the distribution is evenly divided between all documents in the collection at the beginning of the computational process. The PageRank computations require several passes, called "iterations", through the collection to adjust approximate PageRank values to more closely reflect the theoretical true value. A probability is expressed as a numeric value between 0 and 1. A 0.5 probability is commonly expressed as a "50% chance" of something happening. Hence, a PageRank of 0.5 means there is a 50% chance that a person clicking on a random link will be directed to the document with the 0.5 PageRank
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In Off-Page optimization, inbound links are the most important factor for your website to get displayed in search engine results page.
Benefits:
1. If you are getting inbound links from relevant sites then you have probability to get more relevant traffic to your websites.
2. Based on number of quality inbound links you are getting, the more you have chances to be visible in search result page bringing more traffic to your website.
Similarly it happens in case of websites. Your website is well designed with good content and is SEO compatible but you get very few visitors.
Let’s go back to Library. There is a very famous writer called “Mr. A”. His books are also available in the library. You got a reference of your book title in his books. Now all his readers will see the reference note in his book and visit your book also.
Assume that there is another book similar to yours – Lets name them “Book A” and “Book B”. “Book A” gets references from 40 other writers who are not so popular. “Book B” gets reference from 4 very popular authors. So definitely anyone will trust on “Book B” because well known personalities are talking about “Book B”. Similarly search engines will evaluate how many links your website is getting and what is the quality of those links. Based on this your link will be displayed in SERP.
Note: Search engine also considers other factors like domain age, content, etc.
Conclusion is; getting 40 links from low PR websites is much better than getting links from 4 websites with good PR value.
This is how inbound links are evaluated by search engines to rate a website.
Follow these instructions while bringing any inbound link to your website:
1. You have placed your URL on a site called “website A” using direct URL. That is, http://www.domainame.com/. This means, the “website A” is saying search engine that they just know you but what exactly you do they don’t know. Putting a simple URL will decrease the value of your inbound link.
2. Similarly you have placed your URL on a site called “website A” using anchor text. That is, SEO Training. This means, the “website A” is saying Google that they know you and you provide SEO Training. With simple anchor text the value of inbound link increases.
3. You Can use Free SEO Tools and get simple anchor text and Keywords from Keyword Suggestion Generator .
If you are getting an inbound link in the above mentioned form from a well known website then the value of that link will be to the maximum extent. Eg: A specialist of your industry talking about you and your services will make a good impact in the market.
Note: If you provide SEO Training then bringing an inbound link from a website related to your industry is better than bringing an inbound link from Metal Manufacturer website.
Precaution:
1. There are services which provide you 100’s of links.
2. Make sure that the inbound links you are getting are not having “no follow” attribute in the anchor tag.