Google AdSense allows website owners to earn money by displaying advertisements from Google's AdWords program on their sites. When visitors click on these ads, the website owner earns revenue that is typically around 68% of the cost per click paid by the advertiser. AdSense works by auctioning advertising spots to companies bidding for placement, with ads targeting relevant topics earning more per click. Website owners can see their total daily or monthly earnings but not the amount generated from individual ads. Revenue depends on the number of targeted site visitors and how well ad topics match the site's content.