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Google PageRank is Google's unique search engine ranking algorithm. The role is to measure how important a particular Web page is to other pages in the search engine's index. It was invented by Larry Page and Sergey Brin in the late the 1990s. Page rank implements the link value concept as a ranking factor.

PageRank value, now a lot of SEO are advised not to care too much. The main reason is the mainstream search engine optimization view that PageRank value in the Google ranking algorithm, the role has been getting lower. PageRank level, the search engine rankings do not have any role.

Google PageRank's idea is to link the page as a vote. In this way, to explain the importance of the Web page. Then, decide on the page's search engine rankings. At first, the idea was perfect. But then, search engine research enthusiasts discovered this loophole in search engines and found a way to manipulate search engine rankings, making PageRank patents less effective.

In a way, PageRank is like a user, the possibility of clicking a link randomly on the internet to reach a particular page. The more pages you link, the more important the PageRank algorithm will be. Therefore, there is a higher PageRank. Each link to another page adds PageRank to the page. Web pages with higher PageRank are generally improved through more links to other pages.

If you want to view the PR value of your site, you can access: http://toolbar.google.com/T5/intl/zh-CN/index.html, download Google's toolbar, you can see the PR value of their site.

PageRank value, usually updated 3 months, 1 year update 4 times. But in the past two years, Google PageRank updates seem to have become erratic. Slow, it may be 5-6 months to update. Quick, maybe 1 months to update three times. Take this year's recent PR value update as an example:

1.7 month 26th, PR value update

2.8 Month 23rd, PR value Small update

3.9 month 27th, PR value update

From the frequency point of view, the basic interval of 1 months or so, on the update.

PageRank is just one factor in Google's search engine ranking algorithm. In recent years, the changes have not been high PageRank value to get search engine rankings. Even low PageRank value or no PageRank value of the Web page, as long as the site content to do good, still get good keyword rankings.

Now, Google in the design of search engine algorithms also take into account the links, link stability, the authority of the links and many other search engine ranking factors. Therefore, the PageRank link algorithm has become more rigorous than in the past. Building RELATED links usually leads to higher PageRank.

But do not go into the link misunderstanding, if it is to improve the value of PageRank and built too many spam links, may incur the penalty of search engines. PageRank is widely believed to be the site of reliable factors, in many domestic websites in the exchange of links, the direct request PR value must reach how much. Because users tend to believe that sites with higher values are more famous and authoritative.

In Google search engine system, the PR algorithm is not the only Google ranking algorithm, but the PR algorithm is one of the most familiar. Other algorithms for sorting Web pages are: 1. Hilltop 2.HITS 3.TrustRank

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