The compactdisc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings
CompactDisc Digital Audio (CDDA or CD-DA), also known as Digital Audio CompactDisc or simply as Audio CD, is the standard format for audio compact discs
A shaped compactdisc is a non-circular compactdisc. Examples include business card CDs, CDs in the shape of a star, a map of a country, interview material