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

# Terms & definitions

- [What is a Data Source?](https://docs.pdap.io/about/terms-and-definitions/what-is-a-data-source.md)
- [Terminology](https://docs.pdap.io/about/terms-and-definitions/terminology.md)