Google Shopping Graph
The Google Shopping Graph is Google's constantly updated dataset of products, sellers, prices, and reviews from across the web. It is what Google's search and AI shopping surfaces draw on to answer buying questions.
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What this means for your store
Your products reach the Shopping Graph through your Google Merchant Center feed and the structured data on your pages. Keeping both complete and current is how you make sure Google's AI surfaces have an accurate, full picture of what you sell.