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

# CONCEPTS

- [Visibility in the Catalog](https://docs.apinity.io/concepts/visibility-in-the-catalog-2.md)
- [Services without APIs](https://docs.apinity.io/concepts/services-without-apis.md)
- [Authorization](https://docs.apinity.io/concepts/authorization.md)