MP4 is the name of a type of computer data file, so MP4 Players are a type of hardware that will play the MP4 format, either directly or indirectly (using conversion software). Whereas an MP3 player plays only audio an MP4 player will play video as well as audio.
	Typically in today's market the term MP4 Player is used more as a marketing term rather than a statement of capability. With this in mind it is important that any potential MP4 player owner does their home work to understand what their chosen player will actually do. Most, if not all MP4 players, and Touch Screen MP4 players will offer the ability to play music, view pictures and watch video files. On top of this, players will offer extra features including radio, games, clocks, alarm, TV out, e-book or text file viewing.
	Like an MP3 player, you will need a computer to use an MP4 player, and ideally access to the internet.