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DVD (also known as "Digital Versatile Disc" or "Digital Video Disc") is a popular optical disc storage media format. Its main uses are video and data storage. Most DVDs are of the same dimensions as compact discs (CDs) but store more than six
times as much data. Variations of the term DVD often describe the way data is stored on the discs: DVD-ROM has data that can only be read and not written, DVD-R and DVD+R can record data only once and then function as a DVD-ROM. DVD-RW, DVD+RW and DVD-RAM
can both record and erase data multiple times. The wavelength used by standard DVD lasers is 650 nm, and thus the light has a red color. DVD-Video and DVD-Audio discs respectively refer to properly formatted and structured video and audio content. Other
types of DVDs, including those with video content, may be referred to as DVD-Data discs. As next generation high-definition optical formats also use a disc identical in some aspects yet more advanced than a DVD, such as Blu-ray Disc, the original DVD is
occasionally given the retronym SD DVD (for standard definition).
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