Retargeting functionality is basically used to target ads to users that are tracked by your tracking pixels. It gives the opportunity to increase your CTR and attract an audience. The tracking pixel is placed on the predefined resources. The user gets the tracker when visits the page with it. After that, the user can be targeted to ad campaigns of this segment.
To set up your retargeting segment, please follow these simple steps:
Click on Create new segment button
Set the segment name in the appeared window and click Save button.
Now you can use the pixel to improve your campaign targeting.