Google announced the introduction of dynamic sitelinks via the Inside AdWords blog. The dynamic sitelinks are automatically generated sitelinks that are displayed below your ad text, it makes connecting potential customers to relevant pages on your website easier. Google explains it as another example of AdWords tools that add value to your ads while saving time as well as simplifying campaign management.
Google has said that impression share for dynamic sitelinks will be low thus it is important to continue adding as well as optimizing sitelinks. The sitelinks set up by you will always show excluding the few cases where the dynamic sitelinks might perform better.
A dynamic sitelink clicked by users will be free for the advertiser but clicks on the headline of the ad and other ad extensions are chargeable. Google explained that you can also disable dynamic sitelinks, though they boost the average performance of an ad.
Google also stated that they are constantly working on ways for improving the ad experience for users and advertisers. Sitelinks help in enhancing this experience by increasing the relevance of your ads along with the relevance of the user experience delivered by you after the click.Google Unveils Dynamic Sitelinks Globally,