Many audio playback software applications and electronic devices feature a playlist. A playlist is a list of songs or audio files either set up by default, in the case of audio CDs or set up by the user. Songs can be added to a playlist, then played in sequence, or in random order.
Many MP3 music devices, like the iPod, as well as smartphones and computers include a preloaded audio application with a playlist feature. If no application is preloaded, one can usually be downloaded an installed for free or low cost. Popular audio applications for computers include iTunes, Windows Media Player, VLC, and WinAmp. MP3 music devices usually have their own proprietary software installed for use. Smartphones offer many apps that can play back MP3s. Most, if not all, of these applications will feature a playlist for users to create their own list of songs to play and in which order they prefer.