> For the complete documentation index, see [llms.txt](https://server-side.docs.sirdata.net/sirdata-server-side/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://server-side.docs.sirdata.net/sirdata-server-side/english-1/f.a.q-server-side/ad-blocking/definition-of-ad-blocker.md).

# Definition of Ad-Blocker

An ad-blocker is a built-in or manually added extension to a web browser designed to block requests related to user tracking. These requests can include advertisements, web analytics, and affiliate tracking.

**Objective**

The main goal of an ad-blocker is to intercept and block all requests associated with tracking technologies, even when the user has explicitly given consent. This includes:

* Advertisements (banners, videos, etc.)
* Data analytics scripts
* Affiliate mechanisms

**Impact**

Ad-blockers directly affect visitor tracking and analytics tools, reducing the ability to collect accurate behavioral data. As a result, marketing or advertising campaign statistics may be skewed due to the absence of certain users in the reports.

**Main Ad-Blockers**

Here are the primary ad-blockers available on the market:

* AdBlock
* U-Block Origin
* Ghostery

**Usage Variability**

The rate of ad-blocker usage within an audience depends on several factors, such as:

* User age
* Type of device used (computer, mobile, tablet)
* Country of origin of the audience

These factors significantly influence the proportion of visitors blocking ads and other forms of tracking.


---

# 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://server-side.docs.sirdata.net/sirdata-server-side/english-1/f.a.q-server-side/ad-blocking/definition-of-ad-blocker.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.