Thanks a lot Google. This is a big help for business websites wanting extra-revenue aside from the usual business.
As AdWords users, you know how effective AdWords can be in driving traffic to your website and how it can turn curious visitors into regular customers. But since not every visit leads to a sale, wouldn’t it be great to have other ways of making money from those visits?
Google AdSense is a free program that helps you earn revenue by displaying relevant ads on your site. We give you a piece of code to put on your site, you choose where to place ads, and you earn revenue when visitors click on them. (To learn more about Google AdSense, watch this video.)
via Using Google AdSense to Complement Your AdWords Account – Inside AdWords.