A handheld device with a built-in DVD drive and flip-over ... CDs can also be played, and players may support MP3 and other formats. See portable media player. THIS DEFINITION IS FOR PERSONAL ...

The Walkman ushered in the then-novel era of on-the-go music consumption, paving the way for portable CD and DVD players, MP3 players, PDAs, and, eventually, smartphones. ...Sony continues to ...