# The PageRank: what is it?

## This word refers to the system used by modern search engines (including, of course, Google founder Larry Page, which is the “inventor”) to determine the general interest of a site and, in a way, its “popularity”.

Google considers that a page is popular when a large number of links point to it. Thus, if a page has been a link to a B page, it will have a potential weight of “popularity”. This weight depends on several factors, including the popularity of page A.

This index is one of many factors used by Google to classify search results. However, it should not be seen as the only factor without being completely left out.

To conclude, it is important to note that there are actually two PageRank. One that is used by the Google algorithm to classify the results, which has been called here by the “PageRank algorithm”. This PageRank algorithm is a number that is known only from Google and which certainly has many numbers after the comma. It is updated very regularly (one source reveals that it is updated every 5 minutes).

The second PageRank is a “pagerank commercial” that Google reveals to various webmasters and Internet users in order to get an idea of the popularity of one page. This PageRank is rounded to full numbers and is only updated 3 or 4 times per year. Thus a page can have an important PageRank algorithm but this is revealed only to updating the PageRank algorithm.

Knowing that this term is not easy to explain in a few lines, it is recommended to continue reading with the links mentioned.

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## Distinction between the two PageRank

There is a distinction between the two PageRank that are really different. It is common that most beginners confuse them or do not know the distinction between these two indices and I see it perfectly. That’s why these first chapters are designed to show the difference between these two PageRank.

To try not to get lost in what will follow, each of the two PageRank will be called by a different name so that they distinguish them and not confuse them:

PageRank CommercialPageRank algorithmBeware, these are names I just invented to distinguish them. You will not find similar information on the Internet with these “names”.

## PageRank provided by Google

The PageRank commercial is made available by Google. It lets us see this index and it updates about every 3 months. Such an update period corresponds to 3 or 4 updates in the year. But this is the average “current” and it is not guaranteed that Google keeps this update frequency.

This index has real values, that is, there are no figures behind the comma. And we must also know that this score ranges from 0 to 10.

Unfortunately, it is not that note that is used in Google’s algorithm to help classify the results it offers to visitors. It’s just a marketing tool for Google. Indeed, this search engine saw its popularity rating climb when it revealed this value, while on the contrary, all the other search engines hid all the data carefully about the way they transcribed the results.

By visiting the web tools available on this site, you can calculate the PageRank of one page. This tool recovers only the pagerank commercial and not the PageRank that is actually used by Google in its algorithm.

## PageRank used in the algorithm

The PageRank algorithm is calculated and updated very regularly. According to some sources and experiences, it seems that it is updated every 14 minutes, which is really enormous when one takes into account the huge databases of Internet pages that Google owns.

For small information, in December 2008 an institute reported 186 727 854 Internet sites throughout the Internet. This represents only domain names and not the number of pages on the Internet (which is inevitably much more important than 186 million).

The values of the PageRank algorithm are variable and in general, the pages surely have values with many figures behind the comma.

When updating the pagerank commercial, i. e. when there is a Google Dance, the two PageRank normally have the same value. Thus, the pagerank is almost equal to the PageRank algorithm. This is the right time to have fairly accurate data about the popularity of a site. Unfortunately, the more time passes and the more these two values can differ since the PageRank algorithm can vary, while the other is constant and will only be modified at the next Google Dance.

## Origin of word

The PageRank is a trademark of Google that corresponds to the algorithm for calculating the popularity of a web page. This algorithm was the first stone in the Google building. It’s thanks to this idea of genius that the 2 founders of Google have popularisés their search tool. The author of the algorithm is Larry Page, the co-founder of this gigantic company. The algorithm also bears its name.

## General explanation

Larry Page left the hypothesis that Internet users want to see popular sites as a priority in the results of a web search. Therefore, less known sites must appear below the same results.

Example: Let’s imagine 2 sites talking about the same subject. A blog that talks about “Word” software and a computer site that offers news and tips for “Word” software. When searching the web, what is the site you want to find as a priority?

There is a great chance that we must give priority to the big site of quality.

## Method of calculation

The question that everyone is asking is: ” How Google does to know if a page is popular “.

According to the first algorithms used by Google, a page is popular when many pages make it a link. Indeed, when a site is interesting many other sites talk about it. This is the case for all reference sites in their field.

Moreover, it is also within a site. If all pages of a site link to the home page, then it will be considered popular and probably have a better PageRank than others.

Therefore, the calculation of PageRank takes into account 2 types of links to determine if a page is popular: internal links (from the site itself >) and external links (from other sites).

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