A direct access storage device that is written and read by light. The most common types are CD, DVD and Blu-ray. As removable media, optical discs superseded the earlier magnetic disk cartridges ...

CD players cannot play DVD and DVD-ROM discs. DVD formats include DVD-Video (often simply called DVD), DVD-ROM, and DVD-Audio. DVD-Video discs hold digitized movies or video programs encoded using ...

An earlier Compact Disc format for full-motion video. Introduced in 1993 and developed by Panasonic, Philips, Sony and JVC, a Video CD (VCD) held 74 minutes of VHS-quality video and CD-quality ...