Measure user clicks on any given creative by providing an input in the Click URL field (under Tracking on the New Creative/Edit Creative page).
Video creatives can have separate URLs since the VAST XML document will tell the player what to fire when there’s a click. For video creatives, you can specify the event (i.e., click, completion, quartile, pause), but display creatives do not have this option.
For display creatives, JS tags are used.