A DVD (Digital Versatile Disc/Digital Video Disc) is a form of optical disc storage used for storing media such as videos. They were developed by the companies of Sony and Phillips in 1995 and store more than 6 times the amount of data as a CD (Compact Disc). Some DVD's are called DVD-ROM meaning that once information has been stored in them, the information cannot be modified, and other DVD's are called DVD-R, the R standing for Re-Writable. They come in different formats with different capacities of storage. Data is encoded through DVD's through laser technology and overtime, advances have been made for the image quality of a DVD. In 2006 a new format was released known as the Blu-Ray with better image and sound qualities, but DVD's still prove to be superior in market sales.
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