First, here’s a very brief outline of exactly how AdSense works:
The amount you can earn per click vary enormously from a few cents to many dollars. Yes, get your AdSense participation right, and you can earn several dollars a click!
AdSense is Google’s syndication program for its AdWords advertisements.
This means that it is Google’s way of placing AdWords ads on other people’s site – including potentially your own - so first up you need to understand AdWords to make sense of AdSense.
Google AdWords and AdSense