The QuickTime file extension is formatted as QTFF and denotes a multimedia container file. The container file can include a range of data formats such as audio, video, text or any special effects embedded within it.
The QTFF format is a flexible data container file that can contain multiple data items, making it easily manipulated by a user. The QuickTime file format uses an MPEG-4 format, similar in structure to an MP4 file. As of 2014, the MP4 is the more internationally adopted standard, but the file format can also be opened using a QuickTime client. QTFF was initially developed by Apple, Inc.