An MP3 player is a solid-state device that stores music digitally in flash memory, rather than using a removable medium such as a tape or CD. There are many different makes and models of MP3 player, with a wide variety of available memory capacities and many different functions available beyond playback of music. Despite the proliferation and popularity of the MP3 player, there are advantages and disadvantages to the platform in comparison to removable media such as CDs. Writer Bio