> For the complete documentation index, see [llms.txt](https://docs.commercelayer.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.commercelayer.io/core-api-reference/customer_groups.md).

# 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).


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