What is Google AdSense ?AdSense is an advertising system from Google. This program allows people to show advertisements in their web sites. For example, if you own a web site, you can join the AdSense program and start showing Advertisements from Google.
When you join this program, Google will give you few lines of script which you need to insert in your web page. This script will automatically display advertisements relevant to the content of your web page. You can see an example in this page. See the advertisements from Google on top of this page. Since this page is about Google AdSense, probably the advertisements you see are related to Google AdSense.
When your visitors click on the Ads in your web page, you will earn revenue. Google will send you the payments once in a month. You can learn more about AdSense in http://www.google.com/adsense/ or find answers to some common questions.
Anybody who owns or manages a website can join the AdSense.
Even if you do not have a website, you can participate in revenue sharing websites like IndiaReviewChannel.com and make money from internet.