An MP3 player or Digital Audio Player is an electronic
device that can play digital audio files. It is a type of Portable Media
Player. The term 'MP3 player' is a misnomer, as most players play more than the
MP3 file format.
Since the MP3 format is widely used, almost all players can
play that format. In addition, there are many other digital audio formats. Some
formats are proprietary, such as MP3, Windows Media Audio (WMA), and Advanced
Audio Coding (AAC). Some of these formats also may incorporate digital rights
management (DRM), such as WMA DRM, which are often part of paid download sites.
Other formats are patent-free or otherwise open, such as Vorbis, FLAC, and
Speex (all part of the Ogg open multimedia project).