# Juju

> Juju is an open source orchestration engine for deploying, integrating, and managing applications across Kubernetes, VMs, and bare metal using software operators called charms.


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## Pages in this subsection

- [Upgrading things](https://documentation.ubuntu.com/juju/2.9/reference/upgrading-things.md): > See also: How to upgrade your deployment

## Optional

- [Top-level llms.txt](https://documentation.ubuntu.com/juju/2.9/llms.txt): Complete documentation index.