: It typically uses H.264 or H.265 codecs to provide high-quality video at relatively small file sizes.
: It is the industry standard for streaming and is supported by almost all modern hardware and software players.
: It may be a specific asset ID from a private content management system or a cloud storage service where files are renamed to unique numeric strings to avoid duplicates.
Regardless of the specific content of "23951," an MP4 file serves as a digital multimedia container.