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# Adblocker criterion
Adblocker is a triggering criterion that enables defining a [segment](/assets-library/creating-and-managing-segments.md).
To learn how to create a segment, please refer to this [article](/web-experimentation-and-personalization/targeting-step/how-to-create-a-segment-who-section.md).
## đź“– Definition
The Adblocker triggering criterion enables you to include or exclude visitors who have an adblocker on their browser to trigger your campaign.
## ⚙️ Configuration
To configure the Adblocker criterion, select the Adblocker trigger in the list of triggers and select if you want include (`is using`) or exclude (`is not using`) browsers using an adblocker.
If you include browsers using an Adblocker, the campaign will be triggered only when the adblocker of the visitors’ browser is enabled on their active session.
Conversely, if you exclude browsers using an Adblocker, the campaign will be triggered only when the AdBlocker of the visitors’ browser is disabled on their active session.
## đź’ˇ Use case
For example, you want to display a message on your website to warn your users that they need to disable the adblocker on their browser to be able to watch a video.
In this case, you need to display the campaign to visitors who use an AdBlocker on their browser.
To do so, select *is* in the AdBlocker triggering criteria of your campaign.
If visitors disable the AdBlocker of their browser after they see the message, they won’t see the message anymore and will be able to watch the video. If they enable the AdBlocker again afterwards, they will see the message again.
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