Page Rank is the algorithm that analyze your sites and pages. All sites have page rank given by the Google between 1 to 10 where 10 gives no.1 ranking.
http://goo.gl/ZNLxYT

P R is an algorithm which used by Google Search to rank websites in their Search Engine results.

it is simple as that u r 1st position holder in school or at number 9

Generally Page rank Starts from 0 to 10. But, here google consider High Page rank number like 10 is the most authority site and it allows the rank which depends on the site performance such as traffic, quality content and Backlinks also be considered.
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It's a Link Algorithm for Link Analysis. Like this:-

Construction Companies in Noida

I thinks PR not important this time.

PageRank is an algorithm used by Google Search to rank websites in their search engine results. Like 1,2,3 .......... 10.

Here any know when will be PR updated?

page rank will provide the authority of your site in google.

Page rank
 

Search engines especially, like Google used this algorithm to rank websites in search engines. It names after Larry Page, one of the founder of Google.

PageRank is what Google uses to determine the importance of a web page. It's one of many factors used to determine which pages appear in search results.

Page rank is not more a seo aspect, its dead as confirmed by Google also.

The world "pagerank" basically derived from google's owner "Larrypage". Pagerank describe the power of website

Pagerank is mostly about off-site optimization, meaning the number and quality of incoming, non-reciprocal links. In order to increase in less time and professionally , I'll recommend to hire a professional from SEOclerks.

Google determined that how importance of a webpage by the results of search engine marketing that is called page rank.

PageRank is an algorithm used by Google Search to rank websites in their search engine results.