An Ad Server is a large, high-capacity platform that stores, tracks and exposes the ad content advertisers want displayed digitally. Ad Server software reports ad performance: user clicks, post-click and post-impression activities, enabling Networks and Exchanges to establish metrics-based pricing. Ad Serving can be managed by a stand-alone system, owned by an individual publisher, by an Ad Network, or via a module that's bundled into an all-in-one Advertising Management Platform.