> ## 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.

💡 **Things 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)