DVD

DVD ("Digital Versatile Disc" or "Digital Video Disc") is an admired optical disc storage space media format that can be used for data storage, like movies with high video and sound quality. DVDs be similar to Compact Discs in that they have the precise appearance (i.e. diameter: 120 mm or 4.72 in, occasionally 80 mm or 3.15 in.) and both are optical storage media so similar that a DVD reader or writer can usually read CDs, but DVDs are encoded in a dissimilar format of much greater density, allowing a data storage capability 8 times greater (single-layer, single-sided).

All read-only DVD discs, regardless of type, are DVD-ROM discs. This includes replicated (factory pressed), recorded (burned), video, audio, and data DVDs. A DVD with properly formatted and structured video content is a DVD-Video disc. Everything else, (including other types of DVD discs with video content) is known as a DVD-Data disc. Consumers use the term "DVD-ROM" to refer to pressed data discs only, but that is wrong usage; moreover, the term DVD is also applied basically in describing newer video disc formats, Blu-ray Disc and HD DVD.