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# Reference

<!--
Welcome to Juju Reference docs -- our cast of characters (tools, concepts, entities, and processes) for the Juju story!

When you install a Juju {ref}\`client <client>\`, for example the  {ref}\`juju-cli\`, and give Juju access to your {ref}\`cloud <cloud-substrate>\` (Kubernetes or otherwise), your Juju client {ref}\`bootstraps <bootstrapping>\` a  {ref}\`controller <controller>\` into the cloud.

From that point onward you are officially a Juju  {ref}\`user <user>\` with a {ref}\`superuser\` access level <5348md>\` and therefore able to use Juju and {ref}\`charms <charm>\` or {ref}\`bundles <bundle>\` from our large collection on {ref}\`charmhub\` to manage {ref}\`applications <application>\` on that cloud.

In fact, you can also go ahead and add another cloud definition to your controller, for any cloud in our long {ref}\`list of supported clouds <list-of-supported-clouds>\`.

On any of the clouds, you can use the controller to set up a {ref}\`model <model>\`, and then use Juju for all your application management needs -- from application {ref}\`deployment <deploying>\` to {ref}\`configuration <configuration>\` to {ref}\`constraints <constraint>\` to {ref}\`scaling <scaling>\` to {ref}\`high-availability <high-availability>\`  to {ref}\`integration <relation-integration>\` (within and between models and their clouds!) to {ref}\`actions <action>\` to {ref}\`secrets <secret>\` to {ref}\`upgrading <upgrading-things>\` to {ref}\`teardown <removing-things>\`.

You don't have to worry about the infrastructure -- the Juju controller {ref}\`agent <agent>\` takes care of all of that automatically for you. But, if you care, Juju also lets you manually control {ref}\`availability zones <zone>\`, {ref}\`machines <machine>\`, {ref}\`subnets <subnet>\`, {ref}\`spaces <space>\`, {ref}\`secret backends <secret-backend>\`, {ref}\`storage <storage>\`.
-->

* [Action](https://documentation.ubuntu.com/juju/2.9/reference/action.md)
* [Agent](https://documentation.ubuntu.com/juju/2.9/reference/agent.md)
* [Application](https://documentation.ubuntu.com/juju/2.9/reference/application.md)
* [Bundle](https://documentation.ubuntu.com/juju/2.9/reference/bundle.md)
* [Charm](https://documentation.ubuntu.com/juju/2.9/reference/charm.md)
* [Cloud (substrate)](https://documentation.ubuntu.com/juju/2.9/reference/cloud.md)
* [Configuration](https://documentation.ubuntu.com/juju/2.9/reference/configuration.md)
* [Constraint](https://documentation.ubuntu.com/juju/2.9/reference/constraint.md)
* [`containeragent`](https://documentation.ubuntu.com/juju/2.9/reference/containeragent.md)
* [Controller](https://documentation.ubuntu.com/juju/2.9/reference/controller.md)
* [Credential](https://documentation.ubuntu.com/juju/2.9/reference/credential.md)
* [High availability (HA)](https://documentation.ubuntu.com/juju/2.9/reference/high-availability.md)
* [Hook](https://documentation.ubuntu.com/juju/2.9/reference/hook.md)
* [Hook command](https://documentation.ubuntu.com/juju/2.9/reference/hook-command.md)
* [Juju](https://documentation.ubuntu.com/juju/2.9/reference/juju.md)
  * [Juju architecture](https://documentation.ubuntu.com/juju/2.9/reference/juju/juju-architecture.md)
  * [Juju component cross-version compatibility](https://documentation.ubuntu.com/juju/2.9/reference/juju/juju-cross-version-compatibility.md)
  * [Juju security](https://documentation.ubuntu.com/juju/2.9/reference/juju/juju-security.md)
* [`juju` CLI](https://documentation.ubuntu.com/juju/2.9/reference/juju-cli.md)
* [`juju-dashboard` (The Juju dashboard)](https://documentation.ubuntu.com/juju/2.9/reference/juju-dashboard.md)
* [`juju` web CLI](https://documentation.ubuntu.com/juju/2.9/reference/juju-web-cli.md)
* [`jujuc`](https://documentation.ubuntu.com/juju/2.9/reference/jujuc.md)
* [`jujud`](https://documentation.ubuntu.com/juju/2.9/reference/jujud.md)
* [Log](https://documentation.ubuntu.com/juju/2.9/reference/log.md)
* [Machine](https://documentation.ubuntu.com/juju/2.9/reference/machine.md)
* [Model](https://documentation.ubuntu.com/juju/2.9/reference/model.md)
* [Offer](https://documentation.ubuntu.com/juju/2.9/reference/offer.md)
* [Pebble](https://documentation.ubuntu.com/juju/2.9/reference/pebble.md)
* [Placement directive](https://documentation.ubuntu.com/juju/2.9/reference/placement-directive.md)
* [Plugin](https://documentation.ubuntu.com/juju/2.9/reference/plugin.md)
* [Relation (integration)](https://documentation.ubuntu.com/juju/2.9/reference/relation.md)
* [Removing things](https://documentation.ubuntu.com/juju/2.9/reference/removing-things.md)
* [Resource (charm)](https://documentation.ubuntu.com/juju/2.9/reference/resource-charm.md)
* [Resource (compute)](https://documentation.ubuntu.com/juju/2.9/reference/resource-compute.md)
* [Scaling](https://documentation.ubuntu.com/juju/2.9/reference/scaling.md)
* [Script](https://documentation.ubuntu.com/juju/2.9/reference/script.md)
* [Space](https://documentation.ubuntu.com/juju/2.9/reference/space.md)
* [SSH key](https://documentation.ubuntu.com/juju/2.9/reference/ssh-key.md)
* [Status](https://documentation.ubuntu.com/juju/2.9/reference/status.md)
* [Storage](https://documentation.ubuntu.com/juju/2.9/reference/storage.md)
* [Subnet](https://documentation.ubuntu.com/juju/2.9/reference/subnet.md)
* [Telemetry](https://documentation.ubuntu.com/juju/2.9/reference/telemetry.md)
* [Unit](https://documentation.ubuntu.com/juju/2.9/reference/unit.md)
* [Upgrading things](https://documentation.ubuntu.com/juju/2.9/reference/upgrading-things.md)
* [User](https://documentation.ubuntu.com/juju/2.9/reference/user.md)
* [Worker](https://documentation.ubuntu.com/juju/2.9/reference/worker.md)
* [Zone](https://documentation.ubuntu.com/juju/2.9/reference/zone.md)