# Browser language criterion
Browser language 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).
## 📖 Definition
The Browser language triggering criterion enables you to include or exclude the browser language used by the visitors for their current session.
## 🔎 How does it work?
ABTasty gets this information from the browser’s `navigator.language` variable.
## ⚙️ Configuration
To configure the Browser language criterion, select if you want to include (`is`) or exclude (`is not`) a specific browser language.
Then, select the language you want to include or exclude (according to your previous selection) in the second drop-down list.
If you include a specific browser language, all the other languages will automatically be excluded from the targeting.
Conversely, if you exclude a specific browser language, the other languages will be included in the targeting of your campaign.
## 💡 Use case
You may want to display a message to your most engaged users who speak English. In this case, you need to display the campaign to loyal users using English as their browser language.
To do so, select `is` `English` in the Browser language triggering criteria and choose `Loyal` in the Engagement level segmentation criteria of your campaign.\
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