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The Google PageRank Algorithm Explained
I want to quickly show you the PageRank algorithm; but don’t worry; I’m not going to get hung up on it. In fact, you really don’t need to be able to read and follow it, as I explain in a moment. Here it is:

PR (A) = (1 - D) +d (PR (t1) + … + PR (tn) /C (tn))

Where:

PR = PageRank
A = Web page A
D + A damping factor, usually set to 0.85
T1…tn = Pages linking to Web page A
C = The number of outbound links from page tn

If you would like to read all of the nasty complicated details on PageRank please visit the Web Work Shop because they explain everything concerning pagerank.

I could explain all this to you, honestly I could. But I don’t want to. Furthermore, I don’t have to because you don’t need to be able to read the algorithm. For instance, do you recognize this equation?

F = GMm/R²

Don’t think you can kid me. I know you don’t know what this is. (Well, okay, maybe you do, but I’ll bet over 95 percent of my readers don’t.) It is the Law of Universal Gravitation, which explains how gravity works. I can’t explain this equation to you, but I really don’t care because I’ve been using gravity for some time now without the benefit of understanding the jumble of letters.

The other day, for instance, while walking down the street someone shoved a flyer into my hand. After walking on, glancing at the flyer, and realizing that I didn’t want it, I held it over a trash can, opened my hand, and used gravity to remove it from my hand and deposit it into the trash can. Simple.

Rather than take you through the PageRank algorithm step by step, here are a few key points that explain more or less how it works:

As soon as a page enters the Google index, it has an intrinsic PageRank

A page has a PageRank only if it’s indexed by Google. When you place a link on a page, pointing to another page, the page with the link is voting for the page it’s pointing to.

Linking to another page doesn’t reduce the PageRank of the origin page, but it does increase the PageRank of the receiving page.

Pages with no links out of them are wasting PageRank; the don’t get to vote for other pages.

A single link from a dangling page can channel that page rank back into your site.

The page receiving the inbound link gets the greater gain.

It’s important to understand that Web sites don’t have PageRank; Web pages have a PageRank. It’s possible for a site’s home page to have a high PageRank, although its internal pages rank very low.
Here are a couple of important implications from this:

* You can vote large amounts of PageRank through your site with a single link.
* You can ensure that PageRank is well distributed around your Web site by including links to every page from every other page on your site.