Google AdWords Ad Site Links: Getting More Screen Real-Estate and Visitors by Having up to 10 Additional Links That May be Shown With Your Ad
Contents
A New AdWords Feature
Which Ads Qualify
How to Implement
Charges

A New AdWords Feature – increasing Choice and Relevancy in Search Ads
Introduced in November 2009, Ad Sitelinks is a new AdWords feature to extend [...]

AdWords ads are seen whenever your keywords (and those of your competitors, both directly and indirectly) cause your ads to "enter the ad auction".
This auction is triggered whenever a keyword search is carried out, or a browser refresh.
The resulting ads delivering impressions (being shown on your device screen) can vary widely depending on a number [...]