AdSense is a free, simple way to earn money by displaying targeted ads next to your online content. With AdSense, you can show relevant and engaging ads to your site visitors and even customize the look and feel of ads to match your website.
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. They can generate revenue on either a per-click or per-impression basis. Google beta-tested a cost-per-action service, but discontinued it in October 2008 in favor of a DoubleClick offering (also owned by Google).