The Evolving Google Search Story, or
SEO, How to get to the top of Google and Page Rank

The essence of discovery is based on them. Metadata and their tags (Meta-tags) are all about automating things, making them machine readable, and the algorithm is the machine that does the reading. One of the most famous techniques is Page-Rank. Up to 2011, it used to dictate, almost exclusively, who will be successful on the web.

Dominance of Google historically
Google originally was one of many search engines. Around 2000 to 2002, Google became the dominant search engine with Bing and Yahoo being very much smaller. Google was different from other search engines. The key breakthrough was Google Page-Rank. Whereas previous search engines had looked for search terms, and then employed a few back-end fixes and tweaks, Page-Rank would go for a totally different model. It would look at the links to a website, and see each link as a vote of support for that website and its content. So, the more pages linked to a given website, the more that websites link would be worth. This system of backlinking was, as Google saw it, the architecture of the internet, and would provide more relevant search information. It didn’t rely on guess work about what was important, but interpreted the internet as already supplying that information in its very structure. That is until now…

This diagram reveals the principles behind Page-Rank. Essentially it looks at the web in terms of a probability distribution. What is the probability that if you click on a random link, you will land at a given website? This kind of analysis lets you gauge the importance of an element within any given set. They saw the web as one big set or graph, and each link an indication of importance in that graph. While this wasn’t totally new it did fundamentally transform the business of search, and changed what dictated a web pages search position.

Source: Michael Bhaskar Profile Books