# 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. 2026 CC-BY-SA, Canonical Ltd. ## Pages in this subsection - [Action](https://documentation.ubuntu.com/juju/3.6/reference/action.md): Juju actions reference: charm-defined operations for application-specific tasks like backups, user management, and debugging. ## Optional - [Top-level llms.txt](https://documentation.ubuntu.com/juju/3.6/llms.txt): Complete documentation index.