Expandable bannersExpandable bannersExpandable banners are Rich Media Ads that expand in size when a user rolls…//read more are Rich MediaRich mediaAdvertisements with which users can interact (as opposed to solely animation)…//read more Ads that expand in size when a user rolls over or clicks on them. They reveal more advertising information and are designed to grab the attention of the user. The IAB provides guidelines for expandable banners in the Rich Media Ads section of the Display Advertising Creative Format Guidelines Quick Reference Guide