Ad server and ad tracking system

This infrastructure stores and serves creatives and tracking pixels. Creatives can be sent to publishers via ad tag (a URL that points to the creative sitting on the server) or they can be sent directly to the DSP. All user interaction with the ads tracked on an ad server can be used to report on reach, ad interaction and conversions. DoubleClick
Campaign Manager, Sizmek and Adform are currently the most renowned players with ad server solutions.