> ## Documentation Index
> Fetch the complete documentation index at: https://datum-4926dda5-docs-api-reference-demo.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Resource Manager

> Organizations and projects — the top-level containers for everything you run on Datum Cloud.

Datum Cloud groups everything you build under the `resourcemanager.miloapis.com` API. An **Organization** is the top-level container that owns billing, membership, and access; a **Project** lives within an organization and holds the resources you actually run — DNS zones, networks, and more. **OrganizationMembership** connects a user to an organization and assigns the roles that grant them access. Together these form the container hierarchy that every other Datum Cloud resource lives inside.

<Warning>
  The Resource Manager API is **alpha** (`v1alpha1`). Fields and behavior may change in backward-incompatible ways between releases.
</Warning>

## Resources

<CardGroup cols={2}>
  <Card title="Organization" icon="building" href="/api/resource-manager/organization">
    The top-level container that owns billing, membership, and access for everything beneath it.
  </Card>

  <Card title="Project" icon="folder" href="/api/resource-manager/project">
    A container within an organization that holds the resources you run on Datum Cloud.
  </Card>

  <Card title="OrganizationMembership" icon="user-plus" href="/api/resource-manager/organizationmembership">
    Connects a user to an organization and assigns the roles that grant them access.
  </Card>
</CardGroup>

## Learn more

* [API resources overview](/api/overview) — the resource reference landing page across all Datum Cloud services.
* [Changing resources](/datumctl/resources/changing) — how to apply, edit, and safely preview changes to these resources.