A format for storing audio and visual data. Comparable in size to a CD (compact disc), the DVD has significantly more storage capacity (enough space to store a 133 minute movie) and can hold both A/V information and data (like subtitles, and multi-language title abilities.) The A/V information found on DVD is MPEG2, and the digital output of a DVD player to an A/V receiver is AC3 (Dolby Digital).
The next generation of digital discs. A DVD uses similar methods to and looks like an ordinary CD. Hence DVD can be used for the same tasks as a CD e.g. DVD-Rom, DVD-Audio and DVD-Video. DVDs have a much greater capacity than CDs (a CD has a capacity of 640Mb, a DVD has a maximum theoretical capacity of 18 Gb = 18000 Mb). This greater capacity means entire movies can be put onto a single disc using MPEG-II compression. DVD uses several technical tricks to further improve performance namely dual layering, multiple data streams and variable bit-rate . Each DVD disc also has a menu system allowing the user to choose the disc options, view any scene or look at the supplied extras.
Previously known as Digital Video Disc, this represents the latest in home theater. This format is has the ability to have multiple aspect ratios, several different versions of a movie with several different captions as well as Dolby Digital sound.