Product feed
A product feed is a structured file or data connection that lists your products and their key attributes (title, price, availability, identifiers, images, category) in a format machines can read. It is how catalogs reach shopping channels, including AI shopping agents.
How it works
A feed is a clean, structured copy of your catalog: one row per product, with defined fields. Google Merchant Center feeds, platform catalog feeds, and the feeds defined by ACP and UCP are all versions of the same idea. When an agent needs candidates for a shopping query, a feed is one of the two places it looks; the other is your live web pages.
A commerce example
Two feeds list the same backpack. One includes category, a GTIN, color, volume in liters, and material as their own fields. The other has a title and a price and little else. When a shopper asks for "a 30-liter waterproof daypack in black," the first feed can be matched against every part of that request. The second cannot, so it loses even though the product is a fit.
What this means for your store
The feed is only as good as the data in it. A thin feed competes as poorly as a thin web page. Fill in category, identifiers, and real attributes as fields rather than burying them in the description, and keep price and availability accurate. Most of this is editable in your store admin; structured data on your pages backs it up.