# 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 - [How to manage secret backends](https://documentation.ubuntu.com/juju/4.0/howto/manage-secret-backends.md): Configure and manage secret backends in Juju, including Vault integration for secure storage of credentials and sensitive data. ## Optional - [Top-level llms.txt](https://documentation.ubuntu.com/juju/4.0/llms.txt): Complete documentation index.