Google Adsense

According to Wikipedia,Google Adsense is a program run by Google that allows publishers in the Google Network of content sites to serve automatic text, image, video, or interactive media advertisements, that are targeted to site content and audience. These advertisements are administered, sorted, and maintained by Google, and they can generate revenue on either a per-click or per-impression basis. Put it simply :

"Google Adsense is a program provided by Google to pay

someone like us who is willing to learn and work hard."

#Think Simple

Basically, you earn money each time people visit your blog or click on your advertisements. Per-impression will generate less revenue compared to per-click. Either way, I suggest you not to click on your own ads or anything dodgy. Focus on creating a good blogs and #believe, money will come to you. Even though no one click on your ads, you will still earn revenue from getting visitors or impressions.

Learn more from :
-  Google Adsense for Beginners  : Sign up, Submit Application, PIN Verification, Integration, Payments.
-  Google Adsense for Advanced   : Managing Ads.