[SEO Manual Chapter 2a]



To master search engine optimization (SEO), it’s important to understand the history and nature of search engines – especially Google (which provides the bulk of web-wide search engine queries in the Western world).

The bulk of this SEO guide will focus on working with the Google search engine for three simple reasons:


• Market share

According to RealTimeStats, nearly 80% of 2011 global web searches were conducted on Google’s search engine. China’s Baidu comes in second with just under 10% of all global searches (though almost all in China). Yahoo and Bing combine for less than 9% of the global search market. The remaining 1% is shared by dozens of smaller search engines, with Ask.com, AOL, Excite and Lycos leading the pack.

Google Has Only Indexed a Fraction of the Internet

Google Has Only Indexed a Fraction of the Internet

• SEO difficulty

Google has one of the most active anti-spam team and most difficult algorithm. Ranking well on Google will usually provide an immediate boost on other search engines.

• Reach

By most estimates, Google has indexed somewhere between 70% to 90% of the publicly available pages on the web.


But the entire Internet is actually not on the web. In 2010, it’s estimated that the Internet contained more than 5 million Terabytes of data. Google had only indexed 200 TB of all that Internet data – or just 0.004%.

Why so little? The truth is that much of the Internet is excluded from search engines and made available to members. Another reason is that many publicly available websites are unreachable by the major search engines because they lack proper optimization… which is why SEO is so important.



Next SEO Manual post:  A Brief History of Search Engines


The Web1Media SEO Manual is an advanced search engine optimization (SEO) guide developed by Web1Media and serialized for public use. The SEO tactics, strategies and principles discussed in this SEO manual have been gleamed from our own experiences in the SEO, SEM and online marketing arena. If you would like to cite any portion of this SEO guide for non-profit use, we would be honored and simply request a citation link.

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