Many modern search engines use page rank and back links as one way of measuring how relevant a website is to a particular search query. As a gross simplification, more and better quality back links = higher page rank = higher search engine rankings for your site.
Google Page Rank Is Dead – Or Is It? Part I
For a long time now, marketing gurus all over the world have been talking about google page ranking. Page ranking is simply Google’s way of measuring your pages accordingly.
Google PR Explained
Many newcomers to SEO mistake Google’s PR with Google rankings. This article explains the true meaning of Google PR and how it can be used in Search Engine Optimization.
Google PR is Case Sensitive
According to web standards, all URLs should be case sensitive. This is the case for Google and other search engines, but unfortunatelly this rule is not respected by Microsoft servers. This means your website could be serving duplicate content on hundreds or thousands of pages. Read this article to protect yourself against this issue.
Article Submission – Google PR
While there is some debate among SEO experts, most agree that article submission will help gain a higher Google PR.