Interstitial advertising,

Definition of Interstitial advertising:

1. Broadcast media: Very short-duration commercials inserted between two programs or ads of longer duration.

2. Internet: Ads that appear in a separate (pop up) window while a webpage is loading, or are inserted between the contents of the page. These ads normally contain flashy graphics and are said to be more effective than banners. They, however, always increase the webpages loading time.