# Immuta Users

Immuta policies are dynamic and change for the user accessing data. Every user accessing policy-protected data must exist in Immuta, regardless of if they will interact with the Immuta UI.

## How-to guides

* [Manage personas and permissions](https://documentation.immuta.com/2024.2/people/immuta-users/how-to-guides/managing-personas-and-permissions): Add, edit, and delete the permissions on your Immuta users.
* [Use user impersonation](https://documentation.immuta.com/2024.2/people/immuta-users/how-to-guides/user-impersonation): Enable, grant, and use user impersonation for Azure Synapse Analytics, Databricks, Redshift, Snowflake, or Starburst (Trino).
* [Manage attributes and groups](https://documentation.immuta.com/2024.2/people/immuta-users/how-to-guides/managing-attribute-and-group): Add, edit, and delete user's attributes and groups.
* [Map user IDs](https://documentation.immuta.com/2024.2/people/immuta-users/how-to-guides/external-user-mapping): Ensure policies and audit work correctly by mapping the user's ID from the integration to Immuta.
* [Configure an external user info endpoint](https://documentation.immuta.com/2024.2/people/immuta-users/how-to-guides/custom-external): Configure your IAM in Immuta to retrieve users' groups and attributes from an external HTTP endpoint.

## Reference guides

* [Personas and permissions](https://documentation.immuta.com/2024.2/people/immuta-users/reference-guides/personas-and-permissions): This reference guide describes Immuta's permissions and the user personas that they apply to.
* [Attributes and groups](https://documentation.immuta.com/2024.2/people/immuta-users/reference-guides/attribute-and-group-overview): This reference guide describes attributes and groups in Immuta.