which is good search engine

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There r so many mil transferring websites are in Internet. But only some of the websites are very popular because popular websites only give require informations. YAHOO is one of the popular website.It is mail transferring website and also a good search engine. Now a days YAHOO network are growing very speed than any other mail transferring websites. But now a days Yahoo search engine is not popular. GOOGLE is only popular than YAHOO search engine. Among this which one is very good search engine? what do you feel?