QuickTime is a media format developed by Apple. QuickTime video files may be compressed using one of several standard codecs, but they are saved in a proprietary format. MOV files can be viewed with Apple's free QuickTime Player or another QuickTime-compatible program.
About Apple QuickTime Player
QuickTime Player is a free video player that can be used to play QuickTime movies and several other video file types. The QuickTime components, including QuickTime Player, are included with Mac OS X. Windows users can download the software for free from Apple's website. QuickTime X, which is bundled with Mac OS X Snow Leopard, also includes basic video editing features.