An MP3 CD is a compact disc with audio files stored on it in the MP3 format. Burn an MP3 CD if you plan to listen to your music through a CD player or if you want to back up your favorite music to optical media.
Audio file formats – MP3, AAC, WAV, FLAC
Audio files on an MP3 CD are stored like any other file on a regular CD-ROM, using the Yellow Book CD standard. This storage method differs from audio CDs, such as those sold in music stores, where the files are encoded in an uncompressed format using the Red Book CD standard. The quality of audio CDs is higher than that of compressed MP3s.
The audio files on a standard audio CD are not compressed, so the maximum playing time you can get from them is about 80 minutes. An MP3 CD, on the other hand, lets you extend this maximum playing time considerably and store many more songs.
Music stored in the MP3 format is encoded in a compressed format and takes up less storage space than uncompressed files. An MP3 CD can hold eight to ten albums or up to 150 songs on a single disc. However, the exact number depends on the format, encoding method, and bit rate used.