Better known as a Product Listing Ad, a PLA is part of Google Shopping which is an extension of AdWords. You will see these ads on the SERP pages as product images. PLA ads are displayed to the user when someone searches for your products on google.com. Google will then show them a picture of the product with the price and your store name. When a customer clicks on your ad they will be directed to a landing page on your website where they can purchase your item.