Rich media

The defining characteristic of rich media is that it exhibits dynamic motion. This motion may occur over time or in direct response to user interaction.

More simply…. advertisements with which users can interact
Built with…. including but not limited to sound, video, or Flash
Engaging…users can interact with an ad just as rich as a website
Formats…. banners and buttons as well as transitional and various over-the-page units such as floating ads, page take-overs, peel-backs and Video