Although the basic principle of operation of all search engines is the same, the minor differences between them lead to major changes in results relevancy.
The differences boil down to the algorithms that assign relevancy to site content and keywords. Each engine uses slightly different algorithms, but those little differences can result in dramatically different site positioning in search results for a site. Different engines value content in different ways and many engines periodically change their algorithms so a site that might place highly one month can fall down the results the next if an engine sees fit to change their algorithms. The key to conquering more than one engine is knowing what each of them is looking for and how to strike a careful balance between those specification when optimizing your site.
Let's take closer look at what specific engines are looking for:
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Yahoo! Places primary importance on on-page keywords, keyword density and overall relevancy. Yahoo! Does not value older sites over newer sites and therefore, you can climb these results quickly as a new site.
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MSN also places primary importance on on-page keywords, keyword density and overall relevancy
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Accoridng to SEOBook, Google values sites on primarily on the value of the incoming links. Google likes to see other sites linking to yours that have a high page rank. Sites that have incoming links from other sites with high page ranks quickly climb both the search results and page rank. Google is also concerned with keyword relevancy to content and the age of the domain. Google values domains with tradition and places newer domains in their sandbox which prevents them from climbing the results and page rank for a set period of time. Google requires sites to mature in order to climb their results.
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