Google Adsense - For Web Publishers
Earn more revenue from your website, while providing visitors with a more rewarding online experience. Google AdSense� automatically delivers text and image ads that are precisely targeted to your site and your site content�ads so well-matched, in fact, that your readers will actually find them useful. And when you add Google WebSearch to your site, AdSense delivers targeted ads to your search results pages too. With AdSense you earn more ad revenue with minimal effort�and no additional cost.

Google Adwords - For Advertisers
Reach people when they are actively looking for information about your products and services online, and send targeted visitors directly to what you are offering. With AdWords cost-per-click pricing, it's easy to control costs�and you only pay when people click on your ad.