> For the complete documentation index, see [llms.txt](https://help.visibrain.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.visibrain.com/platform-guide/filters-subtopics-and-filter-library.md).

# Filters, subtopics and Filter Library

One of Visibrain's key added values is our powerful filtering system. 

It enables you to shift through the available data, analyze and create graphs and analytics to comprehend information you're looking at. 

[Use the filtering system](/platform-guide/filters-subtopics-and-filter-library/use-the-filtering-system.md)

[Create subtopics](/platform-guide/filters-subtopics-and-filter-library/create-subtopics.md)

[Filter Library](/platform-guide/filters-subtopics-and-filter-library/filter-library.md)

[Filter examples](/platform-guide/filters-subtopics-and-filter-library/filter-examples.md)

{% hint style="info" %}

#### What are the differences between a subtopic and the Filter Library?

* **Subtopic** are essentially subdivisions of a broader *Topic*, created to provide a better organization of content, you can use them to save a filter used to refine a Topic to, for example, focus on a sub-theme, \
  It's linked to the monitoring *Topic*. \
  You can find a *Subtopic* on the homepage and access it with one click, just like the other *Topics*.
* **The Filter Library**, on the other hand, are a list of general *Filters* you can invoque to use on any set of data and in any topic. 
  {% endhint %}


---

# 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:

```
GET https://help.visibrain.com/platform-guide/filters-subtopics-and-filter-library.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.