The full form of MP4 is MPEG-4 Part 14.
MP4 is a digital multimedia container format most commonly used to store video and audio, but it can also store other data such as subtitles and still images. According to the reference, it can package multiple media types including video, audio, images, and 3D imagery, together with complex metadata, making it possible to deliver navigation and other interactive elements to viewers. MP4 is based on the QuickTime File Format (.mov).
