PageRank (PR) is a mathematical algorithm that Google uses to rank pages of the websites in its search results.
As per the Google, Pagerank determines the importance of a website by counting the number and quality of links to the pages of the site. The basic assumption is that more important sites tend to receive more backlinks from other websites.
The rank value determines the importance of a particular page.
Research (from AOL's search engine logs) shows that more than 90% of the buying decisions start with a search online. And the first ten search results receive the majority (89%) of the entire click-through traffic. And the next ten results which are usually displayed on the second page receive less than 5% of the click-through traffic.
Therefore ranking on the first page is so important that companies can rise or fall due to their Google search results when customers are looking online for the products and services that they sell.
Few facts about PageRank are:
PageRank is just one of the numerous factors that Google uses in its search result Algorithm. There are various other factors also that affects the Google's search rankings. One should focus instead on delivering quality content.
Outbound links help the ranking of the website. Therefore they are ranking factors too.
The algorithms are so complicated and complex that sometimes even leading search engineers working for Google don't understand them. It is almost impossible to know every bit of code because Google has made over 450 algorithm changes in one year.
The greater the number of links on a page, the less each link's worth.
You cannot use no-follow to control where the PageRank goes. So if you have five links on a page and two are no-followed, the PageRank calculation will still count the number of outbound links from that page to 5 even when 2 of the links are no-followed.
Outbound links never pass the full amount of PageRank. The amount of PageRank that flows out per link is always varied. All the links pass a little less or a little more PageRank than what came into the page in the first place.
A link from a reputed or an authority site will help increase the rankings in search engines might not be a right expectation.
An outbound link might have a negative ranking value if it is linked to an irrelevant website.
The entire site doesn't lose ranking when it passes PageRank. PageRank is more about the pages and the inbound links associated with those pages. So most likely, a site doesn't lose its rankings with outbound links. An important and relevant page will be able to attract attention and rank through links.
Every page has its own importance. While considering the links on a page, there isn't any need to consider whether an outbound link is going to impact the ranking of another page negatively.
The quality and usefulness of the web page to its users determine its importance and ranking in search engines and not the entire website.
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