What is the difference between Google Ad-words and Google Ad

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The Google AdWords program enables you to create advertisements which will appear on relevant Google search results pages and our network of partner sites. To learn more about AdWords and begin advertising immediately, please visit <!-- w --><a class="postlink" href="http://www.adwords.google.com">www.adwords.google.com</a><!-- w -->.

The Google AdSense program differs in that it delivers Google AdWords ads to individuals' websites. Google then pays web publishers for the ads displayed on their site based on user clicks on ads or on ad impressions, depending on the type of ad