Google, unlike other search engines rely heavily upon inbound links. Taking this into account, this serves as a main principle of how Google ranks pages contained within a website. It is vital to understand that each page within a website will have its own PageRank (0-10, ten being the best) and is determined by the PageRank of other pages referring to it.
Obviously, you would want your homepage or landing page to have a very high ranking. Understand, however, a PageRank of 5 or 6 is actually a fairly high PageRank. It is understood by many SEO experts that the “possible frequency of visits” to a page will render its PageRank.
According to SEO Administrator, this is the process of how a user follows links to surf a network, thus ultimately shaping the foundation of a PageRank:
It is assumed that the user starts viewing sites from some random page. Then he or she follows links to other web resources. There is always a possibility that the user may leave a site without following any outbound link and start viewing documents from a random page. The PageRank algorithm estimates the probability of this event as 0.15 at each step. The probability that our user continues surfing by following one of the links available on the current page is therefore 0.85, assuming that all links are equal in this case. If he or she continues surfing indefinitely, popular pages will be visited many more times than the less popular pages.
The PageRank of a specified web page is thus defined as the probability that a user may visit the web page. It follows that, the sum of probabilities for all existing web pages is exactly one because the user is assumed to be visiting at least one Internet page at any given moment.