Google is most popular search engine among webmaster and web surfers. It provides most accurate results and many other type of services like blogs, news and shopping products.
http://www.google.com/Yahoo Search Engine
Yahoo is combined search engine with portal and most of its user comes with search as well as other products offers by yahoo, Yahoo also offers paid search and paid directory listing.
http://www.yahoo.com/SEO Services Company Since 1998
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