If you mean Alexa site rank, that's just your position in the worlds sites, as judged by Alexa toolbox users. Google Page Rank is a slightly obsolete indication of how important your page is in Google's eyes, judged by inbound links.
Thanks dear for your reply. actually i was confused about that and you have removed my confusion. i want to increase my inbound links please suggest me how to get high quality inbound links my website is about Unique Articles and all the articles are 100% unique.
PageRank is a numeric value that represents how important a page is on the web. Google figures that when one page links to another page, it is effectively casting a vote for the other page. The more votes that are cast for a page, the more important the page must be. Also, the importance of the page that is casting the vote determines how important the vote itself is. Google calculates a page's importance from the votes cast for it. How important each vote is is taken into account when a page's PageRank is calculated. PageRank is Google's way of deciding a page's importance. It matters because it is one of the factors that determines a page's ranking in the search results. It isn't the only factor that Google uses to rank pages, but it is an important one.