# Introduction

In this section, you can find detailed information about the main concepts that revolve around **CKBull Signer API.**

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Please note that this platform is in its first version, and therefore new concepts could be introduced in future versions.
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The main concepts are:

* **Sign in requests:** Requests generated by the dApp meant to identify a user and retrieve its metadata.
* **Transaction requests:** Requests that contain a transaction proposal and are expected to be signed by an identified user.

Since the two concepts are related, we recommend following the order of the guide.


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# Agent Instructions: 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:

```
GET https://docs.ckbull.app/guides-and-concepts/introduction.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.