> For the complete documentation index, see [llms.txt](https://docs.umbraco.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.umbraco.com/umbraco-engage/marketers-and-editors/profiling/external-profile-data.md).

# External profile data

Umbraco Engage does not provide a built-in way to add additional data to a profile. You can store the data in any format and in any way.

Your system may associate an Umbraco Engage visitor with other data coming from an external system such as a Customer Relation Management (CRM) system.

If you want to use external data in a custom segment you have to write the data access yourself in the custom segment code. Learn more about this in the [Profiling section for Developers](/umbraco-engage/developers/profiling/external-profile-data.md).

![External profile data tab](https://2164986937-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fds5IoWmsX6a6ooVdYthx%2Fuploads%2Fgit-blob-f6390a1f002d80fe420836408d496abf587a1bba%2FExternal-profile-data-tab-v16.png?alt=media)


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