What is the Google Page Rank? And its importance for the site?

It is A Logarithm which is based on measuring the popularity and importance of web pages by Google search engine scale or in other words, it is the order of appearance of web pages in the Google search engine. And that when you search for a particular topic in the search engine Google. The Google Page Rank is divided into 10 sections the most powerful is No. 10 and the most weak is number 0.In brief, the Google search engine makes a division of the internet pages which is existed in sites to the level from 0 to 10 and not the entire site, but each page separately. When The Google Page Rank raise it means the importance of your page for Google search engine and when The Google Page Rank becomes strong it means that the visitors to the sites will be raised to the site without advertising campaigns.
The reasons that lead to raising The Google Page Rank are basically the backlinks and it is the intermediaries between the pages of the site and the Google search engine when the backlinks becomes more powerful, Google will be more interested in the site, and the web pages will be archived quickly and the commitment of standard for website designing and standard for site content.