# Source & source type criterion
***Source*** and ***Source type*** criteria are triggering criteria 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
***Source*** and ***Source type*** criteria enable you to trigger your campaign depending on the visitor origin.
* **The *****Source***** criterion is based on the source of the visit**. That is to say the **exact website** visitors come from.
* **The *****Source type***** criterion is based on source type of the visit**. It can be an organic, a referral or direct visit.
## ⚙️ Configuration
### Source type
The *Source type* criterion enables you to trigger your campaign when visitors are coming to your website from a specific source type:
| **Source type** | **Definition** |
| --------------- | ----------------------------------------------------------------------------------------------------------- |
| Organic | Visitors coming from the links provided by search engines recognized by Google (Google, Bing, Yahoo, etc.). |
| Referral | Visitors coming from another website (except for Social media). |
| Direct | Visitors who directly entered your website's URL in their browser to access the page(s) targeted. |
***To include two source types, you can directly exclude the third one.***\
For instance, if you want to trigger your campaign when visitors are coming from a referral or an organic source, you need to exclude the *direct* source type.
On the contrary, if you want to exclude two source types, you need to include the third one.
### Source
The *Source* criterion enables you to trigger your campaign when visitors are coming to your website from a specific source determined by the referrer of the page.
Type **`document.referrer`** in the console to find it:
For instance, if you want to trigger your campaign when visitors are coming from Facebook, select `contains` > `Facebook`.
## đź’ˇ Use case
You can choose to trigger your campaign only when visitors are coming from Instagram in order to display a specific message to your Instagram followers and promote a specific game.\
To do so, select the *Source* criterion and select *contains* > *Instagram*.
People coming from other sources (Facebook, direct access, organic, etc.) won’t be included in the targeting and thus won’t see the contest.
## 🔎 How does it work?
We store the information and collect it from the browser. When a session is initiated, we store what is called the `referrer` page URL, communicated by the visitor's browser, inside the `ABTastySession` cookie. This information is collected only if one active campaign is using the “source type” trigger.
The different source types are defined as follows:
* **`Direct`**: if there is no referrer URL at all
* **`Organic`**: if there is any search engine reference inside the URL
* **`Referral`**: if any of the first two conditions are fulfilled
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