A product feed is a structured file, or API, that lists your products one row at a time, each with a defined set of attributes: title, description, price, availability, image, brand, GTIN, and category. Platforms like Google Merchant Center ingest it, and it is increasingly the same clean source that AI shopping surfaces read from.
For AI visibility the feed matters because it hands machines your product facts already labelled, no parsing or guessing. When Google's Merchant Center AI performance report scores "product attribute completeness," it is judging your feed: a shopper asks an AI for a waterproof jacket in size medium, and a feed missing the material or size attribute simply can't be surfaced for that query, even if the same fact sits in an image on your page.
A product feed is the commerce-specific counterpart to structured data: schema markup labels facts on a page, a feed delivers them in bulk. Both make your catalogue legible to shopper agents and agentic commerce systems. Keeping the high-demand attributes complete and current is the baseline for being found in AI shopping.