MP3 is a digital audio file compressed using a standard defined by the Motion Pictures Experts Group (MPEG). It is officially known as "MPEG-1 Layer 3". MP3 can use as little as 10% of the storage required by the CD format. An MP3 player is a device for playing MP3 files.
MP3 players come in various sizes. Unlike desk top computers, flash memory does not lose stored information when the power is turned off. Flash memory is very compact and requires very little power requiring very small bettery devices to power it for a long time. They are also available in various shapes, sizes, colors and styles and can be custom printed with your company logo.