By using drivers, you can group your engagement questions into certain topics. This will make it easier to evaluate results based on a specific topic.
When you go to Studio > Engagement > Drivers, you can add a new driver by clicking on the "Add New Engagement Driver" in the right upper corner
Give your new driver a clear and understandable name. You can add a description to give more information about this driver.
You also can add the driver to a parent driver in the field Belongs to engagement driver. In that way the created driver will be a sub-driver of the parent driver. The results of the questions linked to a sub-driver will be taken into account of the parent driver as well. Mor info about this calculation, you can find in this article: https://helpdesk.intuo.io/support/solutions/articles/19000112147-how-to-analyse-the-engagement-drivers-scores-