ADSENSE

What is AdSense?

AdSense is an advertising program run by Google. Web site owners can enroll in this program to enable text and image advertisements on their sites. These ads are administered by Google and generate revenue on a per-click basis. Google utilizes its search technology to serve ads based on website content, the user's geographical location, and other factors. Those wanting to advertise with Google's targeted ad system may sign up through AdWords.

What is Google Adsense?

Google AdSense is a fast and easy way for website publishers of all sizes to display relevant, text-based, un-obtrusive Google AdWords ads on their website's content pages and earn money. Because the ads are related to what your users are looking for on your site, you'll finally have a way to both monetize and enhance your content pages.

(more info) ADSENSE