Google has announced they are expanding dynamic search ads (DSA) globally. They have now enhanced and retooled the feature from the ground up.
DSA were launched back in 2011. They are auto generated ads based on the pages discovered on the website.
The technology allows Google to build ads without you having to do much. The system analyzes what adds to build by crawling a website and customizing ads to specific landing pages.
Here is a video explaining how it is done:
The system builds the target automatically. It would organize website content into recommended categories for targeting ads. Ads are triggered for search queries only when the advertisers have a relevant landing page. The system can also refine the categories to display more specific categories.
Google Expanding Dynamic Search Ads Globally!,