# Custom Segments

Inspector automatically creates a basic timeline to see what happen inside your application. It will report many type of statements by default. 

Segments give you the opportunity to "monitor" specific code bloks that you consider relevant for your app to create a more complete picture of what's happening on any execution cycle.

### What are segments?

Segments represents tasks performed during an execution cycle, like:

* Http call to external services (webhooks, integration, etc.)
* Functions that deal with files (pdf, excel, images)
* Data manipulation processes (import/export, data aggregation, etc.)

Below you can see an example of how custom segments will appear in the timeline:

![A new segment in the timeline](/files/-LuWgbN9J5ftiM5TDO2T)

You can learn how to add custom segments from the code examples below:

{% content-ref url="/pages/-McFYez8BNvP8qjYxvXw" %}
[Custom Segments](/guides/raw-php/custom-segments.md)
{% endcontent-ref %}


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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.inspector.dev/concepts/custom-segments.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.