Rich media
From DigitalJargonBuster
Rich media is advertising that contains perceptual or interactive elements more elaborate than the usual banner ad. Today, the term is often used for banner ads with pop-up menus that let the visitor select a particular page to link to on the advertiser's site. Rich media ads are generally more challenging to create and to serve. Some early studies have shown that rich media ads tend to be more effective than ordinary animated banner ads.
See also: Flash and the Silverlight