Definitions for "Progressive download"
online video files that users may watch as the files are downloaded. Progressive download files don't adjust to match the bandwidth of the user's connection like a streaming format. Currently, QuickTime is an example of a progressive download architecture.
Movie data that is pushed via HTTP to the client. The movie can be viewed by the user as it is being transferred. This is not a form of media streaming.
Progressive download video files permit the user to begin viewing the movie before it has been completely downloaded.