Anybody Knows about Google Adsense?

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When I am browsing on the internet some of the website i often see an add of Google Adsense. On those add some one says that he/she earn $100 of more from Google. Now I want to know more about Google adsense. I have a blog and I m eagerly want to make more money from this blog with the Google Adsense. please help me mylot's friends.