web 2.0
   Adsense is owned by google. This is a pay per click program. you are paid everytime an ad gets clicked. many people in this world are earning through adsense. In some websites you can see the advertisement labelled ads by google, placed by google adsense. Google adsense is best way to earn online, but this depends upon the readers interest on your site and your site traffic.  

Steps to apply for adsense:
  1. Click this link to apply for adsense Adsense.com
  2. Read the terms and conditions.
  3. Give right keywords related to your blog, to get an idea about the keywords go to  google adwords keytool    Keywords are more important which helps adsense to select the advertisement related to your blog.
  4. Don't click the ads in your website by yourselves, Google will trace it by noting your ip-address, then you will be spammed.
To support your blog adsense has some features:
  •    Google adplanner -   Highlight your Google Ad Planner profile by displaying  adplanner badge on your site, when an advertiser click this badge, your website details such as traffic, demographics, and advertising information are displayed. This help you showcase your site to advertisers. sign in to adplanner adplanner.com 
  • Google friend connect.- In google friend connect you can create a list of questions for user to answer, which helps to know the users idea,  encourage users to get to know each other and personalize their site content, including Google ads.