> For the complete documentation index, see [llms.txt](https://doc.commandersact.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.commandersact.com/features/sources.md).

# Sources

Check out the [Sources catalog](/features/sources/sources-catalog.md) if you merely want to look at the Commanders Act sources and how each is implemented.

## Sources vs Destinations <a href="#sources-vs-destinations" id="sources-vs-destinations"></a>

The platform has [Sources](/features/sources.md) and [Destinations](/features/destinations.md). Sources send data *into* the platform, while Destinations receive data *from* the platform.

{% hint style="info" %}
A source is an emitter of events, more information [here](/getting-started/concepts.md#source).
{% endhint %}

## Source key

The source key is a unique identifier for each Source. It allows Commanders Act to identify which Source is transmitting the data and which destinations should be the recipients of that data. It is also employed to deactivate a source when necessary.

To locate a source key, you initially need to have or create a source like a website, server, or mobile source.

Next, within the Source, navigate to “Settings", and then proceed to “source key".


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://doc.commandersact.com/features/sources.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.