SEO - Search Engines
There are currently only 4 major sources of search engine results - these include Google, MSN, Yahoo/Inktomi and Ask.com. Each of these engines shares their data and search results with other partners (ie: Google -> AOL), but in general, these are the primary 4 engines feeding most other search engines.
By no means does this include all of the search engines out there, but it covers the majority of the traffic-generating search engines. The others are far behind in terms of the number of daily users and queries.
Other search engines might include: metacrawlers/metasearchs, news, pay-per-click, shopping, multimedia, specialty, country-specific or kids only search engines.
A successful search engine plan, depending on the scope and subject matter of your website, should include a varied mix of all types of search engines.
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