Instead of keywords, Shopping ads use product attributes, which are defined in a Merchant Center data feed, to show ads on relevant searches.

Source: All about Shopping Campaign

• Shopping Ads use a carousel format that allows for video, images, and text that change based on the search query.
• Shopping Ads are a text-based-only format that’s easy to set up using keywords and location as the minimum requirement for launching.
• Shopping Ads are highly customizable to match the look and feel of a partner website that uses images and text to drive brand awareness.
• Shopping Ads use product attributes to show ads on relevant searches to increase conversion.

The correct answer is: Shopping Ads use product attributes to show ads on relevant searches to increase conversion.

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All About Shopping Ads and How they works

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