AdSense works like this. Webmasters sign up for an account in just a few minutes. They receive a small snippet of code to include on their web pages. Google will then automatically serve advertisements that are relevant to the content on the webmaster’s pages. re-updated When someone visits the webmaster’s site and clicks on one of Google’s AdSense advertisements, the webmaster earns a fee. Advertisers can pay anywhere from five cents to a hundred dollars per click, and the webmaster receives a percentage of that fee.
Many webmasters are content with earning five to ten dollars from AdSense to cover the cost of web hosting. But many, unsurprising, have higher ambitions. At a popular Webmaster World forum, participants share tips and encouragement on reaching a goal of $300 per day from AdSense.
Google have proven once again that they excel at designing innovative Internet services. If you are in the web industry and have not yet used AdSense, then perhaps you should try it out.

Or if you are already using it, perhaps impressive results will encourage you to track the performance of your AdSense units more closely, fine tune their positions and formats, and take your earnings to a new level.

