> For the complete documentation index, see [llms.txt](https://docs.appear.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.appear.sh/explanations.md).

# Explanations

- [Importing an OpenAPI spec](https://docs.appear.sh/explanations/importing-an-openapi-spec.md)
- [OpenAPI spec version](https://docs.appear.sh/explanations/openapi-spec-version.md)
- [Branches and environments](https://docs.appear.sh/explanations/branches-and-environments.md): Learn about how branches and environments work in Appear.