QuickTime Virtual Reality was a subset of the functionality of Apple Quicktime for non linear movie files. Like linear movies they have the extension .mov and needed QuickTime player installed to be viewed. Very basic QTVR panoramas can also be viewed using PTViewer.
QTVR refered to the ability to display spherical panoramas in Cubic Projection, cylindrical, partial panoramas, multinode panoramas and objects in a viewer where the user could move around or rotate the object using the mouse and keyboard. The panoramas could be linked through hotspots in order to move from one panorama file to the other or linked several panoramas in one multinode file.
While Quicktime 7 standalone, which can play QTVR panoramas, is still available from Apple, there is no web based player anymore.