Product Listing Ads are search ads that include richer product information, such as product image, price, and merchant name, without requiring additional keywords or ad text. Whenever a user enters a search query relevant to an item in your Google Merchant Center account, Google will automatically show the most relevant products along with the associated image, price and product name.
Clicks on Product Listing Ads are charged on a cost-per-click (CPC) basis, or conversion-focused cost-per-acquisition (CPA) percentage basis (select participants in the US only).
Why you’d use them:
Product Listing Ads allow you to promote your products on Google Shopping and create a more engaging user experience.