Human: What is the difference between a cd player and a mp3 player? Assistant: 
The main difference between a CD player and an MP3 player is that a CD player can play CDs, while an MP3 player can play digital music files. A CD player has a larger storage capacity than an MP3 player, as it stores up to 700 MB of data on each disc. An MP3 player typically only holds about 50 MB per song. Additionally, CDs are more durable than digital music files, which may become damaged or corrupted over time.