# Search
> For the complete documentation index, see [llms.txt](/llms.txt)
> Configure and customize the Biel.ai search widget, including ranking boosts and metadata.
The search widget uses semantic search to find relevant content across your indexed sources.
## How search works
Results are ranked by similarity to the query (score between 0 and 1), based on:
- Page content and title
- Meta keywords and description
- URL structure
You can adjust rankings with a [boost score](#boost-search-results): positive values (e.g., `0.5`) increase a page's ranking, negative values (e.g., `-0.5`) decrease it. The final score is the base score plus the boost.
:::tip
Any page with a final score above 0 can appear in results. Use a negative boost (e.g., `-1.0`) to effectively hide a page from search.
:::
## Installation
- [CDN installation guide](https://docs.biel.ai/installation/cdn.md#add-the-search-widget)
- [Platform-specific guides](https://docs.biel.ai/installation.md)
## Customization
### Widget appearance
See [Layout](https://docs.biel.ai/customization/layout.md#biel-search-button) for styling and positioning options.
### Search filters
You can configure filters that let users narrow search results by category (for example, API, Guides, Blog). For details, see [Search filters](https://docs.biel.ai/customization/search-filters.md).
### Metadata and keywords
Add meta tags to improve how your content is indexed and ranked:
```html
```
For Docusaurus, Sphinx, and other documentation systems, see [Metadata by platform](#metadata-by-platform).
### Boost search results
Use boost scores to prioritize certain pages. For example, boost guides by `0.5` so they rank higher, while leaving reference pages at `0` for natural ranking.
Add the following meta tag to the **head** of the page:
```html
```
For Docusaurus, Sphinx, and other documentation systems, see [Metadata by platform](#metadata-by-platform).
### Metadata by platform
Add the **head** tag directly in your markdown content:
```markdown
---
title: Search Configuration
---
# Search Configuration
Your content here...
```
Use the `meta` directive in your reStructuredText files:
```rst
.. meta::
:description: Learn how to configure and customize your Biel.ai chatbot
:keywords: chatbot, configuration, customization, Biel.ai, setup
:biel:boost_score: 0.5
Search Configuration
====================
```
## Limitations
The search widget only indexes website content. Files (PDF, Word, Excel, etc.) are not searchable, even if they are added as project sources.