To help you get the best value from each ad, Google automates ad placement and bidding for maximum conversion value at your given budget. Link to a Merchant Center account, set a budget, upload assets and let us know the country of sale. Your existing product feed and assets are combined with Google's machine learning to show a variety of ads across networks. Our systems will pull from your product feed and test different combinations of the image and text that you provide, then show the most relevant ads across Google networks. In Europe, Smart Shopping campaigns can be used with any Comparison Shopping Service (CSS) that you work with. The ads will be shown on general search results pages and on any other surfaces that the CSS has opted in to.