# Supervisor plugin

> A container the Supervisor runs for the system itself, like DNS or audio, that Home Assistant Core and apps share.

Source: https://contributors.home-assistant.io/glossary/supervisor-plugin/

- In code: `supervisor/plugins/`, `plugin-dns`, `plugin-audio`
- Also: plugin, plugins

There are five: DNS, audio, the command line (CLI), multicast, and the observer. Each has its own repository, like home-assistant/plugin-dns. Users don't install or remove them, and the Supervisor keeps them updated. See [Plugins](https://contributors.home-assistant.io/os/supervisor/plugins/).

## Related terms

- [Supervisor](https://contributors.home-assistant.io/glossary/supervisor/): The part of Home Assistant OS that runs Home Assistant Core and apps, each in its own container, and handles their updates and backups.
- [Home Assistant OS](https://contributors.home-assistant.io/glossary/home-assistant-os/): The operating system made to run Home Assistant, with the Supervisor, apps, and backups. The recommended way to install Home Assistant.