Google.com/Adsense

google.com/adsense
Earn money while displaying advertisements on your Website. When visitors click on these ads, Google pays you. Along with targeted advertising for your content pages, you can add a Google search box to your site and show targeted ads on search results pages. How much you earn depends on a number of factors including how much an advertiser bids on your site -- you'll receive a portion of what the advertiser pays .The best way to find out how much you'll earn is to sign up and start showing ads on your web pages.