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MP4, formally known as MPEG-4 Part 14, is a digital multimedia container format most commonly used to store video and audio, but can also be used to store other data such as subtitles and still images. It is a standardized format developed by the Moving Picture Experts Group (MPEG) and is based on the Apple QuickTime file format.

The MP4 container format is a flexible and widely adopted standard. It allows for the storage of multiple types of data streams, each encoded using different codecs. Common video codecs used with MP4 include H.264 (AVC) and H.265 (HEVC), while common audio codecs include AAC and MP3. This versatility makes it suitable for a broad range of applications, from streaming video online to storing high-definition movies.

One of the key features of the MP4 format is its ability to support metadata, such as chapter information, which can be embedded within the file. It also supports features like random access and seeking, allowing users to quickly navigate through the media content. The file extension for MP4 files is typically .mp4, although other extensions like .m4v are sometimes used, particularly for video content. Its widespread compatibility across various devices and software players has contributed significantly to its popularity.