A Digital Versatile Disk (DVD) is a computer storage device. It is a type of optical disc that is used to store large amounts of data, such as movies, music, or software. DVDs are similar to CDs, but they have a higher storage capacity, which allows them to store more information. They work by using lasers to read and write data on the disk. The data is stored in the form of tiny pits and lands on the disk, which are read by the laser. DVDs are widely used for entertainment purposes, as well as for data storage and backup.