> For the complete documentation index, see [llms.txt](https://onestopconcept.gitbook.io/open-endpoints/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://onestopconcept.gitbook.io/open-endpoints/configuration/application-directory-structure/directory-data-sources.md).

# Directory: data-sources

The **mandatory** directory `data-sources` contains data-source definitions. A data-source-definition contains references to one or many data-sources, which you would like to load data from and convert to output using a transformer.

See: [Data-Source](/open-endpoints/configuration/data-source-transformation.md#data-source).

![directory data sources](https://cdn.openendpoints.io/images/gitbook/directory-data-sources.png)