QuickTime is a file format for storing and playing back movies with sound. Though developed and supported primarily by Apple Computer, this flexible format isn't on a Macintosh os's. additionally it is commonly used in Windows systems, and also other kinds of computing platforms. In Windows, QuickTime files usually appear with all the ".MOV" extension.

Since 2002, Apple has started using MPEG-4 video encoding on its QT streams, producing much better, in any other case excellent, video quality.