MPEG-4 Part 14, commonly known as MP4, is a digital multimedia container format most commonly used to store video and audio, but it can also be used to store other data such as subtitles and still images. Like most modern container formats, it allows streaming over the Internet. The official filename extension is .mp4, however, other extensions like .m4v and .m4a are also used. MP4 is a widely supported format, compatible with a vast range of devices and operating systems, making it a popular choice for distributing video content. It uses MPEG-4 compression for video and AAC compression for audio, offering a good balance between file size and quality. MP4 files can contain various types of metadata, such as title, artist, album, and cover art. Because of its versatility and widespread support, MP4 is a dominant format for video distribution on the web, in broadcast, and on mobile devices.