Audio CD is an umbrella term that refers to many standards of means of playing back audio on a CD or a DVD.^{citation needed}

Standards

CD

• Red Book audio - the original means of playing back audio on the medium.
• 5.1 Music Disc - an extension to the red book standard that uses DTS 5.1 surround sound.
• Super audio CD - A format which competes with DVD-Audio. Also uses a proprietary design that can't be easily mimicked by consumer CD copying software.
• MP3 CD - A CD which contains MP3 files in data mode rather than converted from MP3 to red book mode.

DVD

• DVD-Audio - A DVD that plays audio.

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