In order to identify the source of an individual click and help segment all your aggregated click data, Opticks uses URL parameters that have information about the Campaign, ad group or even keywords that triggered the click on the ad. The Tracking Template is where you put all this tracking information.
At the same time, Opticks uses parallel tracking to completely avoid any redirection at user level.
Parallel tracking helps load your landing page more quickly which can reduce lost visits. This can lead to increased conversions, and improved ad performance. Parallel tracking sends customers directly from your Google ad to your final URL while the click measurement happens in the background (without sending the user to the tracking URLs first).