# Customer groups A customer group is a resource that can be used to organize customers into groups. When you associate a customer group to a market, that market becomes private and can be accessed only by the customers belonging to the group. You can use customer groups to manage B2B customers, B2C loyalty programs, private sales, and more. You can optionally define a custom alphanumeric (case-sensitive) `code` for your customer groups, provided that it's unique across the environment (it can contain underscore and hyphens, spaces are not allowed, the maximum length is **25** characters). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.commercelayer.io/core-api-reference/customer_groups.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.