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Some search engines, like Google and Yahoo, use their own databases of websites to produce search results. The other major type, metasearch engines, draw results from multiple search engines and combine them into a single list. This article gives some examples of metasearch engines and explains exactly what they are.
The web sites and pages indexed by each search engine vary, which is one reason why you don't find the same results on Yahoo as you do on Ask.com or Bing. Most metasearch services supply relevant listings from three to seven different engines' databases, reducing the chance that a desirable website will be left out.
Metasearch engines may also reorder the results or offer different ways to refine searches. A few examples of a metasearch engine include Dogpile.com, Click4Choice.com, Mamma.com, and Search.com. Though not as well-known to the public as Yahoo or Google, several of them remain fairly popular and process many searches.
Another metasearch option is LessWaiting.com Search, which supplies results from six different engines: SearchHippo, Miva, Delicious, LessWaiting (small database of its own listings), Exactseek (featured sites in sidebar), and Yahoo. For a page with results from most of these sources, try searching for SPORTS.