In this lesson, you learn how to understand and use ad extensions. You also learn how to choose which extensions to use, and how to implement the Location, Product, Sitelinks, and Phone extensions.
A Google AdWords ad extension is additional relevant information that’s shown along with your ad. Whether—and, if so, exactly when—you should use them is an open question.
The guiding principle behind information on the Internet often seems to be “too much is never enough.” However, Google’s search engine is famous for cutting through the clutter and getting straight to information that people really want. Your AdWords ad might benefit from a similar approach.