# YAML

> A text format for configuration and data, with indentation for structure. Home Assistant uses it for its configuration files, and much more.

Source: https://contributors.home-assistant.io/glossary/yaml/

- In code: `configuration.yaml`, `.yaml`

You meet YAML in many places as a contributor: `configuration.yaml`, automations and scripts, `services.yaml` of an integration, the configuration of an app, the sentences of the intents repository, and the examples in the documentation.

The documentation has its own [YAML style](https://contributors.home-assistant.io/writing/reference/yaml/), so every example looks the same.

## Related terms

- [Automation](https://contributors.home-assistant.io/glossary/automation/): A rule that performs actions when a trigger happens and its conditions are met, like turning on the lights at sunset when someone is home.
- [Markdown](https://contributors.home-assistant.io/glossary/markdown/): A plain text format for writing, where symbols like # and * mark headings, lists, and emphasis. The documentation is written in it.