1. Different sound quality

MP3: After compression, the sound details will be lost and the sound quality layering will be diluted.

CD: CD has lossless sound quality, which is better than MP3.

2. Different sizes

MP3: Flash memory is used, and the size of MP3 is smaller than that of CD.

CD: larger than MP3.

3. Different formats

MP3: It is a compressed audio format.

CD: lossless format encoding.

4. Different saves

MP3: MP3 is easy to save.

CD: CDs are not easy to save.

5. Different playback

MP3: songs are stored in its memory in MP3 format and played.

CD: it reads the song data on the CD and plays it.