Why Google update PR so frequently...

google update pr so frequently because pr depend on the backlink of the site. and backlink of the site changes frequently so that it pr also changes frequently.

Generally speaking,google update one's pr each 3 months,and it depends on your backlinks.High quality backlinks could make you have a high pr.

now google change it's rule it's update any time .........

Google updates might be happening so frequent but I think this are mostly minor updates only. Due to major updates specially in PR happens as been observed every after 3 months in pattern. Backlinks update might be also included every major update. This minor updates are happening so frequent might be due to the following reasons: everyday there are many new sites being born,to determine which sites are valuable or not, tracking the sites which are involved in buying and selling links,many pages are being created and deleted everyday as well as new links are being added and old links are removed and Google are strictly concerned with the content of the sites (which we know G rank sites based on the relevancy and content on users query).

I don't think so....It updates the PR once in three months... that's not a frequent update...

There are thousands of websites on the internet growing up each day, google keeps on changing Algorithm from time to time to make sure that the people get the most relevant information whenever they Search for it.

Google changes its algorithms for every three months. According to these algorithms the PR update would depend. I do agree with the people here, google update one's pr each 3 months, and it depends on the quality backlinks we build.

Page rank is a measure that Google assigns to a websites page based upon the importance of the page on the internet that is determined by the number of back links for that particular website page. The better and relevant is the link back, better will be the page rank in updation.

It not so often, it's once in 3 months, it's ok