Learn in the textbookHow Video Works and Its File Formats
DefinitionMP4 is a container format (コンテナ形式) defined as part of the MPEG-4 standard (Part 14), with the extension .mp4.
ExplanationBesides video and audio, it can also carry data such as subtitles in the same file, and the video inside is usually compressed with H.264 or H.265. It works not only on PCs but also on smartphones and video streaming services, making it one of the most widespread video formats today.