QT is an acronym for QuickTime. Files that contain the .qt file extension are Apple QuickTime movie files.
The QT file format was developed for the purpose of creating, editing, publishing and viewing multimedia files for Apple's QuickTime Player, a media player that is used to play movies, video clips and other multimedia files. QT files can contain movies, videos, animations, graphics and virtual reality content.
Oftentimes QT files are compressed, making it easier to download and distribute the files via the Internet. Compression also makes it easier to stream the videos online.
The QT file format is supported by both the Mac and Windows operating systems.
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