Users can belong to one or more organizations. A user's organization membership is tied to a role that defines what the user is allowed to do in that organization. Grafana supports multiple _organizations_ in order to support a wide variety of deployment models, including using a single Grafana instance to provide service to multiple potentially untrusted organizations.
> **Note:** Most metric databases do not provide per-user series authentication. This means that organization data sources and dashboards are available to all users in a particular organization.
## Compare roles
The table below compares what each role can do. Read the sections below for more detailed explanations.
- Can view, add, and edit dashboards, panels, and alert rules in dashboards they have access to. This can be disabled on specific folders and dashboards.
This role can be changed with the Grafana server setting [editors_can_admin]({{< relref "../administration/configuration.md#editors_can_admin" >}}). If you set this to `true`, then users with the Editor role can also administrate dashboards, folders, and teams they create. This is especially useful for enabling self-organizing teams to administer their own dashboards.
This role can be changed with the Grafana server setting [viewers_can_edit]({{< relref "../administration/configuration.md#viewers-can-edit" >}}). If you set this to `true`, then users with the Viewer role can:
- Make transient dashboard edits, meaning they can modify panels and queries but not save the changes or create new dashboards.
- Access and use [Explore]({{< relref "../explore/_index.md" >}}).
This is especially useful for public Grafana installations where you want anonymous users to be able to edit panels and queries but not save or create new dashboards.