lol. it's adsense. AdSense is an ad serving application run by Google Inc. Website owners can enroll in this program to enable text, image, and video advertisements on their websites. These advertisements are administered by Google and generate revenue on either a per-click or per-impression basis. -wiki
Adsense is very popular platform to earn money through PPC, you would be paid on the basis of pay per click of you published ads on your websites or blogs.