The Page Rank is a term given by Google, In the order from 0 to 10, Based on the traffic and quality of the links of the website having base don these page rank will be given.
The term "Page Rank" is used to measure or reflect the quality of your site. Page rank is calculated on the basis of a variety of aspects like backlinks, .edu or .gov links, visits, bounce rates etc. Age of the domain is also one of the pivotal aspects that influences page rank.