What are Google Shopping Listings?
Google shopping listings are the product ads that appear on Google’s first page when you type in a query. They are the listings with an image of a particular product and price next to them.
You pay once somebody has seen your product and clicked it. This means they generally want or like the product before they have clicked it. For products the message is often in the image or technical specification so the prospective customer will see all this and have the option to buy directly from a Google search.
This simple process is known to get you huge ROI from your AdWords campaign, but only when its done correctly.