DVD

DVD (also known as "Digital Versatile Disc") is a popular ocular disc storage media format. Its main uses are video and data storeroom. Most DVDs are of the same dimensions as compact discs (CDs) but store more than six times as much records.

Variations of the term DVD often depict the way data is stored on the discs: DVD-ROM has data which can only be read and not written, DVD-R and DVD+R can be written once and then functions as a DVD-ROM, and DVD-RAM, DVD-RW, or DVD+RW holds data that can be erased and thus re-written multiple times. The wavelength used by standard DVD lasers is 650 nm.

DVD-Video and DVD-Audio discs correspondingly 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. The term "DVD" is commonly misused to refer to high definition ocular disc formats in general, such as Blu-ray Disc and HD DVD. As a result, the original DVD is sometimes called SD DVD.