Deep Zoom is an implementation of the Seadragon Software technology for use in Microsoft Silverlight and Seadragon Ajax applications. It allows users to pan around and zoom in a large, high resolution image or a large collection of images. It reduces the time required for initial load by downloading only the region being viewed and/or only at the resolution it is displayed at. Subsequent regions are downloaded as the user pans to (or zooms into them); animations are used to hide any jerkiness in the transition.
- From Wikipedia.org