# 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

- [Explanation](https://documentation.ubuntu.com/juju/4.0/explanation.md): Understand Juju concepts: architecture, security, performance, application modeling, and the evolution of charming frameworks.
- [Juju architecture](https://documentation.ubuntu.com/juju/4.0/explanation/juju-architecture.md): Deep dive into Juju architecture: bootstrapping, controller structure, agent communication, and deployment process on Kubernetes and machines.
- [Juju security](https://documentation.ubuntu.com/juju/4.0/explanation/juju-security.md): Comprehensive Juju security guide: threat modeling, access controls, encryption, authentication, audit logging, and secure operations.
- [Performance with Juju](https://documentation.ubuntu.com/juju/4.0/explanation/juju-performance.md): Discover Juju performance benefits: quick deployment, powerful CLI, scalable operations, and efficient cloud resource management.
- [Application modelling](https://documentation.ubuntu.com/juju/4.0/explanation/application-modelling.md): Understand Juju application modeling: service isolation, access control, and abstraction layers for simplified cloud operations.
- [Charms vs. Kubernetes operators](https://documentation.ubuntu.com/juju/4.0/explanation/charms-vs-kubernetes-operators.md): Learn how Juju charms expand on Kubernetes operators, supporting multiple infrastructure types: Kubernetes, VMs, and bare metal.
- [About charming history](https://documentation.ubuntu.com/juju/4.0/explanation/charming-history.md): Explore the evolution of Juju charm frameworks from 2009 to present: Services Framework, Reactive Framework, and Operator Framework.

## Optional

- [Top-level llms.txt](https://documentation.ubuntu.com/juju/4.0/llms.txt): Complete documentation index.