Why Goolge update PR ?

Why Goolge update PR so frequently is there any reason behind it....

I don't think there is a reason for even having pagerank, now that has no meaning in the rankings :)

it's not a answer .i ask different thing why google update pr in 15 days before 3-4 month it takes at least 3 month interval to update pr

No one can answer the question except Google and God. Google act is unpredictable now. Exactly for me the update is every month. On the end of the month.

Its a known fact that PR gets updated every day, and that the PR you get in the toolbar is generally 3 months behind roughly. They give us webmasters that export as an older measurement to our sites success when more weight was put on a numerical page rank value.

The PR of a site now, barely means anything. Of course higher PR sites will have more traffic, but thats not always 100% true, and there are even a lot of sites with higher PR, that get beat out normally to lower ranked sites.

My advice is to stay away from Digital Point, if thats where you're going/getting any SEO advice from, and check sites like sitepoint, TAZ, SEOMoz and a few others that are the laughing joke of the internet

Nikolas - why do you say there's no meaning at ALL for PR?

As much as I know PR still take some place in SEO...

It still matters but it is just one tiny factor from the 200+ factors google uses to rank pages. Just take a look at the SERPs and you'll see. In most queries low pagerank sites are much higher than others with high pr

I agree with nicholas page rank does not mean anything except if you want to selling links to your sites.

If you want to rank high in the search engines you must focus on creating unique content and not on your pagerank

I think Google count the the sites who is valuable to that search engine.

Just do it naturally, no hidden tricks.

Nikolas is correct that pagerank is only one of MANY factors. Do not focus on this. Focus on getting good SERPs and driving quality traffic. If you have a good inbound link strategy to improve your SERPs, this will probably help your pagerank as well.

i do think google change all the time so that nobody could manipulate things
program can be designed and tec can be learnt , change is the only strategy the could resort

yup i agree wid nicholas tht there are lotz of factors which google decide to update pr.

PageRank is essentially a score out of ten as to the "value" of your site in comparison to other websites on the Internet.   This fact reveals that one of three things has occurred in this latest update:

   1. Google has raised the bar on PageRank, making it more difficult to attain a high level, or
   2. The way they are displaying their backlinks has changed, or
   3. The way they calculate the value of an incoming link has changed.

Any of these are possible and has been noted in the past as something they are willing to do. Additionally, it is possible for all to occur at the same time.

even in computer world evolution exists, since competition in seo is getting tough. PR is essential factor for those who means business.

Google update the PR with in 3 -4 months ,according to its set of rule,algorithm.

Nor do I think PR is that important.  But it is very useful when it comes to placing links on other sites. And if you are selling ad space or a domain, it would be very important.

PR has a lesser impact in SEO. But for a new site that links to another,it is always better to link to high PR site.

bcz this time each and every website doing bad marketing that's why google change his Algo and take action so all do well marketing not as spam so make sure google will update his algo and your site ranking is down so change your site info and optimize techniques.

Google update PR to give website the ranking but SERP is more important than PR..

Well i guess because PR shows a good will of a website

Maybe in the near future PR would become like the daily ranking fluctuations and changes, ranging from websites and edited on a daily basis.

PR is the proprietary technology google

The PR is on of the important factor's for getting traffic as the trust towards the site improves its traffic improves its effect   Alexa ranking and you get the best position inn the search engine too. .

Toolbar PR is sometimes known as Foolbar. It isn't reliable, even if it were useful.