what is google adsense??

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hi guys, im just curious about google adsense.. can u share any info regarding this? how can u earn money from this? is it a scam or not? do u know anybody that already earn money from it? is it related to the google site not like the google profusion? because i really want to know more about google adsense... maybe i can earn extra money from it soon... ^_^ thanks in advance for your response... have a nice day and happy mylotting.. ^_^