DVD - (Digital Versatile Disk) - (Previously called Digital Video Disk) - A  type of CD-ROM that holds a minimum of 4.7GB (gigabytes), more than enough for a full-length movie. The DVD specification supports disks with capacities from 4.7 GB to 17 GB and access rates of 600 Kbps to 1.3 Mbps.  These are backward compatible with CD-ROMs. This means that DVD players can play old CD-ROMs, CD-I disks, and video CDs, as well as new DVD-ROMs.  Newer DVD players can also read CD-R disks. DVD uses MPEG-2 to compress video data.  Also see iDVD & Interactive DVDs.