# Users

> For the complete documentation index, see [llms.txt](https://doc.ibexa.co/en/saas/llms.txt).

You can access all users and user groups in the Users tab.

[Users](https://doc.ibexa.co/en/saas/users/users/index.md) in Cohesivo are treated the same way as content items. They're organized in groups such as *Guests*, *Editors*, *Anonymous*, which makes it easier to manage them and their permissions. You can access all users and user groups in the **Administration** panel by selecting **Users**.

![Users and user groups](https://doc.ibexa.co/en/saas/administration/img/admin_panel_users.png "Users and user groups")

> **Caution: Caution**
>
> Be careful not to delete an existing user account. If you do this, content created by this user can be broken and the application can face malfunction.

## Built-in users

Built-in roles and users control the behavior of the system:

### Anonymous user

The Anonymous user, in the **Anonymous users** group, is a special user that controls what data can be seen by unauthenticated users and visitors. It applies both to the UI and [API](https://doc.ibexa.co/en/saas/api/rest_api/rest_api_authentication/#anonymous-access).

### Service Account user

The `REST Service Account` user, in the **SSO users** user group, is used when authenticating to the REST API or MCP Server with [client credentials](https://doc.ibexa.co/en/saas/api/rest_api/rest_api_authentication/#client-credentials).

You can:

- change the permissions assigned to this user
- assign new roles to it
- move it between user groups

**If you modify or delete this user, authentication with client credentials won't be possible.**