query: When was the CD invented?
passage: Compact disc
Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982. The format was originally developed to store and play only sound recordings (CD-DA) but was later adapted for storage of data (CD-ROM). Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, PictureCD, CD-i, and Enhanced Music CD. The first commercially available audio CD player, the Sony CDP-101, was released October 1982 in Japan.
passage: Philips CD-i
The Philips CD-i (an abbreviation of Compact Disc Interactive) is an interactive multimedia CD player developed and marketed by Dutch company Philips, who supported it from December 1991 to late 1998. It was created to provide more functionality than an audio CD player or game console, but at a lower price than a personal computer with a CD-ROM drive. The cost savings were due to the lack of a floppy drive, keyboard, mouse, and monitor (a standard television is used), and less operating system software. "CD-i" also refers to the multimedia Compact Disc standard used by the CD-i console, also known as Green Book, which was co-developed by Philips and Sony.