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.
LaserDisc
LaserDisc was first available on the market, in Atlanta, Georgia, on December 11, 1978, two years after the introduction of the VHS VCR, and four years before the introduction of the CD (which is based on laser disc technology). Initially licensed, sold, and marketed as "MCA DiscoVision" (also known as simply ""DiscoVision"") in 1978, the technology was previously referred to internally as "Optical Videodisc System", "Reflective Optical Videodisc", "Laser Optical Videodisc", and "Disco-Vision" (with a dash), with the first players referring to the format as ""Video Long Play"".