About

DVD discs offer higher storage capacity than compact discs while having the same dimensions.

Pre-recorded DVD discs are mass-produced using molding machines that physically stamp data onto the DVD. Such discs are known as DVD-ROM, because data can only be read and not written nor erased. Blank recordable DVD discs (DVD-R and DVD+R) can be recorded once using a DVD recorder and then function as a DVD-ROM. Rewritable DVD discs (DVD-RW, DVD+RW, and DVD-RAM) can be recorded and erased multiple times.

DVD discs are used in DVD-Video consumer digital video format and in DVD-Audio consumer digital audio format, as well as for authoring AVCHD discs. DVD discs containing other types of information may be referred to as DVD data discs.

http://en.wikipedia.org/wiki/DVD

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