Can anybody give me the information about Googel Adsense

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Hi friends, I saw some discussions on Google Adsense. Exactly what it is? How we can earn money from adsense, what are the requirements for that? we need any website. Can anybody give me the details on this. Some body is telling they are getting the money value in dollors from this site, and some others are telling their income is in cents. In this what is true.