Page rank is a numeric value that range from 0 to 10 with 10 is the best page rank.
Page rank determines the importance of your page. the importance of a page determines its ranking in Google search results.
As the number of inbound important and relevant links to a page increased its page rank will increase.
When page A links to page B, Google consider that page A votes for page B.
But Google also analyze the page that casts the vote to see if it is relative to your page.
So it is not only the number of inbound links, they must also be important and relative.


Google

 

pagerank

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.