text: The standard for low bandwith video telephony and multimedia.Comparing with mp3,mp4 can plays videos.\nPlus mp4 allows streaming over the internet. It also allows multiplexing of multiple video and audio streams in one file, variable frame- and bit-rates, subtitles and still images. Apple's QuickTime file format was the design starting point of the *.mp4 file format. Although *.mp4 still resembles the QuickTime format, it has been improved upon in many different ways.\nI hope this will help u.