# 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 - [Model](https://documentation.ubuntu.com/juju/4.0/reference/model.md): Juju model reference: logical workspaces for applications, resources, and configuration. Learn controller and workload model types. ## Optional - [Top-level llms.txt](https://documentation.ubuntu.com/juju/4.0/llms.txt): Complete documentation index.