GLOSSARY
Primary feed
In brief: The main product data source used to create and update products in Merchant Center.
Related terms
Secondary feed used to add or override attributes without changing the main feed (e.g., custom labels, categories).
Rules inside Merchant Center to transform attributes (concat/replace/map) without changing the source feed.
Structured dataset (XML/CSV/TSV/Sheets/API) containing product data: titles, prices, images, availability and required attributes.
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