> ## Documentation Index
> Fetch the complete documentation index at: https://developers.criteo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Catalog

A catalog is a snapshot of all catalog products from the brands and retailers associated with an account, typically updated once a day. Each account has a single catalog listing all the products that the account is eligible to promote.

<Info>
  **Important to Know**

  * Catalogs are requested and retrieved through asynchronous endpoints.

  * Product attributes are scoped to the retailer, except for universal identifiers such as GTIN, if available.

  * Brand attributes are standardized across retailers.

  * Catalogs are provided in the currency of the retailer.

  * Catalog outputs are UTF-8 encoded.

  * Catalogs are returned as a [newline-delimited JSON byte stream](https://en.wikipedia.org/wiki/JSON_streaming)
</Info>

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## What's next

* [Catalog Endpoints](/retail-media/docs/catalog-endpoints)