By definition, the ad tag is an HTML code that a web browser uses to grab an advertisement from an ad server. It gives the browser the instructions on how to display the ad in the way that the advertiser imagined. What this basically means is that an ad tag is a redirect, not content per se. Still, the term is used more loosely in the marketers community, referring to any kind of link that is used for ad serving purposes. In fact, ad tag has become an umbrella term for everything from general advertising tags to view tags, action tags, and click tags.