A controller under the EU General Data Protection Regulation (GDPR) is an organization or individual who is the controller of the data. The controller determines the purposes and means of processing the data generated based on the data permit.
There may be more than one controller and the controllers may be joint controllers, in which case they define the purposes and means of processing the data together. In the case of a joint controllership, select ‘A third party’ and enter all controllers in the additional information field.