Today,DVD is the most popular digital enterainment in our lives.But do you know when and how does it develop?

In 1990s MultiMedia Compact Disc (MMCD), and Super Density Disc (SD) were being developed.MMCD was backed by Philips and Sony,this was the first taste of digital enterainment.It was unprecedented successful and was supported by most music companies and hardware manufacturers.With the developement of technology,we saw significant advances in the enabling technologies that supported the Compact Disc. Laser optics, reflective films, and disc replication have all made major strides. Digital coding and compression algorithms have become vastly more sophisticated. Moreover, integrated circuits and drive mechanisms have made impressive advances. Then Sony began to work on the next generation of optical media which vastly increased capacity, with the ability to feature an entire movie in high-quality digital video on a single side of a disc.

The first DVD players and discs were made in November 1996 in Japan.DVD was originally an initialism for "Digital Video Disc". As a video and audio storage,it owns its special format.It stores the informations of video and audio in a digital way.To date,kinds of DVD devices and computers have been used. Yon can convert DVD/IFO to avi by using a DVD ripper to watch your favourite movie on your computer or ipod.