> For the complete documentation index, see [llms.txt](https://developer.celigo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.celigo.com/api/api-reference/api-management.md).

# API Management

Expose your integration logic to external callers. APIs are custom HTTP endpoints that external systems call synchronously and that return a structured response; APIM is the management layer that publishes and governs them.

APIs are built from the same steps as flows: see [Exports, imports & tools](/api/api-reference/exports-imports-and-tools.md).

| Resource                                                                   | What it covers                                                  |
| -------------------------------------------------------------------------- | --------------------------------------------------------------- |
| [APIs](https://developer.celigo.com/api/api-reference/api-management/apis) | Custom HTTP endpoints that external systems call synchronously. |
| [APIM](https://developer.celigo.com/api/api-reference/api-management/apim) | Setup, settings, and analytics for the API management layer.    |