Question: what is the difference between an mp3 and mp4?
Answer: MP4 is a short form for MPEG-4 Part 14. Unlike the MP3, which is exclusively used for audio, an MP4 is a container file that can be used to store audio, video, or other data like subtitles. ... m4a file extension for MP4 files that only contain audio, while . m4v is sometimes used to indicate that's a video.