# 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 - [Write an integration test](https://documentation.ubuntu.com/juju/3.6/contributor/howto/write-an-integration-test.md): Create integration tests for Juju using bash test suites, including bootstrapping, test execution, and teardown procedures. ## Optional - [Top-level llms.txt](https://documentation.ubuntu.com/juju/3.6/llms.txt): Complete documentation index.