Why we serch in Google? What's so special about it ?

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It's really rare that no one had visited google atleast one time.we have so many needs in our lives,keeping us busy and engaged.But for almost every thing we are using google to help,like a professor who knows everything it had helped us so many times,no every time.Eventhough google doesn' allow any adds in its home page,i don't know how do they get money for their needs and how do they manage to stay in top position always.... if some one knows about google well please let me know.