Google helps to gather information or not

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There are so many search engines in the world like GOOGLE, YAHOO etc.. But google is first than any other searh engine.. all search engines have large informations about all topics.. Yahoo is one of the good famous website in the world. It is also a good mail transferring website. Even it is good and very famous website most of the peoples are not prefer the yahoo search engine.. Most of the peoples suggest google website only... Why google is more famous search engine than yahoo search engine. which search engine would you suggest me....