Human: What is the difference between a cd player and a mp3 player? Assistant: 
The main difference between a CD player and a MP3 player is that CDs typically hold more data than MP3s, so they can store more music. Additionally, CD players are usually larger devices with additional features such as an LCD display and speakers, while MP3 players tend to be smaller and simpler with fewer buttons. Lastly, CD players may require you to manually load the disc into the device before playing it, whereas MP3 players often have auto-loading capabilities.