What is Google PageRank?

Google PageRank is [only] one of the methods Google uses to determine a page’s relevance or importance.
Google uses many factors in ranking. Of these, the Google PageRank algorithm might be the best known. Google PageRank evaluates two things: how many links there are to a web page from other pages, and the quality of the linking sites. With Google PageRank, five or six high-quality links from websites such as www.cnn.com and www.nytimes.com would be valued much more highly than twice as many links from less reputable or established sites.
PageRank has only ever been an approximation of the quality of a web page and has never had anything to do with the measuring of the topical relevance of a web page. Topical relevance is measured with link context and on-page factors such as keyword density, title tag, and everything else.

The free PR checker tool enables you to check the current pagerank of your web site instantly via the form above, however, you might consider to be quite boring to visit online page rank checking tool every time you'd like to check Google pagerank of your web pages...

....so, it might be a good idea to put a small page rank icon to your site to check and display your Google rankings right on your web site pages. To check PR icons - Go to Share Menu.