It acts like a "box" that holds different data tracks, including video, audio, subtitles, and images.
MP4s are widely supported across almost all modern devices and can be opened with standard software like Windows Media Player , QuickTime, or the VLC media player . How to Check the Content 7423295-4OLVAnlE.mp4 ...
MP4 files explained: How to open and use - Adobe It acts like a "box" that holds different
If you have this file on your computer and want to know what it contains without a description: 7423295-4OLVAnlE.mp4 ...
If the "4OLVAnlE" part is a YouTube ID, searching for ://youtube.com might reveal the original source.