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PageRank, sometimes abbreviated as PR, is a mathematical voting system based on the links pointing to a web page. It started as a research project at Stanford University and was the initial prototype that led to the creation of Google in 1998.
PageRank is one of many different signals that Google uses to rank pages in the search results. Historically this was of great importance, while there is of far less importance today.
The system is based on that the links are like votes, but the votes are not of equal strength. The strength of a vote (link) is based on the number and strength of the votes that goes to the page where the link is and how many other links there are on that page. This information can be of importance when you try to find better links website.
Distribution of PageRank
The power is distributed to the links on the page, the fewer the links the greater percentage of the power given to each link. A link on a page with 10 links get more power than if the same page would have had 50 links.
Google does not divide power equally to all the links but decide what links is to get more of the juice. As a result a link in the body of the page can have more power than if the same link would have been at the bottom of the page.
The PageRank show up on a scale from 1-10, " Toolbar PageRank ". Google publishes public a value of PageRank on a scale from 1 to 10. This value is usually referred to as Toolbar PageRank and is sometimes abbreviated as TBPR. In fact, the exact value of PageRank a decimal number.
Unlike the pages real PageRank value that is updated all the time, the value of the Toolbar PageRank is always based on historical data and is updated only about 4 times a year. And even when the value has just been updated, the value is taken from a time about one month previous. Google does this on purpose to prevent abuse and manipulation.
The scale between 1 and 10 is logarithmic, that is, the difference between 5 and 6 may be equal to the difference between 0-5, and the distance between 9 and 10 may for example be as large as 0-9 ( as an example).
There are only a few hundred pages on the internet that has a value of 10 as Toolbar PageRank. To reach up to 4 does not seem to be that difficult. If you reach 5 you have come a long way while the road to 6, however is long and hard. To reaching up to 7 tends to be the kind of goal that you never manage to reach, at least for most of us. The search result page rank is not the same as PageRank, the " page rank" is where your page shows up in the search result and this can be confusing to journalists and the novice.
The importance of PageRank today
PageRank is one of over 200 different " signals " that Google looks at to rank pages in their search results. Some of these signals may well be of greater importance and may include the domain's history, the content, how the page links are designed and the looks of the links in. In other words, a page with low PageRank may very well outrank a page with a lot of PageRank in the search result, SERP's.
It is nevertheless important to understand how PageRank works when, for example, designing a sites internal navigation and working with link building. This is something to be aware of when you trying to find better links website.
The word link power is sometimes used to clarify the actual power a link is giving the linked page. This differs slightly from the PageRank as a link may give other signals that are not included in the description of PageRank, such as the anchor text used for the link. Other words for link power is link juice and link strength.
Link power modification
Today there is much that suggests that Google's opinion devalues links depending on things like the link location on the page, the link age, the link relevance, etc. Also note that many of the links that are created today by users on websites often have attribute rel = "nofollow" and such links do not give any link power at all.
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