Have you ever wanted to advertise to people who previously visited your site or mobile app? This remarketing strategy can be implemented using the AdWords API. For example, you can target ads to people who left your website without buying anything to encourage them to return and make a purchase.
We recently updated our 
Remarketing and 
Rule-based Remarketing guides to more clearly show you how to use the API to get started quickly and implement some of the most common remarketing strategies.
Remarketing resources
As always, feel free to visit us or ask questions on the 
AdWords API Forum or our 
Google+ page.
- Andrew Kallem and Amir Lazarovich, AdWords API Team