A product feed is a data file that lists information about all of your products in a specific format. Unless you have a Yahoo! Store, Merchant Solutions, or ProStores account, you must create and upload a feed to Product Submit to have your listings displayed.
Please note: If you have a Yahoo! Store, Merchant Solutions, or ProStores account, you do not need to create a product feed. Product Submit will automatically extract your product details directly from your store.
Review the Product Feed Specifications.