if you are talking about ones that fit in pcs than both the same just different terminology or saying
DVD ROM Definition: The DVD-ROM specification supports disks with capacities of from 4.7GB to 17GB and access rates of 600 KBps to 1.3 MBps. One of the best features of DVD-ROM drives is that they are backward-compatible with CD-ROMs. This means that DVD-ROM 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-ROMs use MPEG-2 to compress video data. DVD Player Definition: Plays standard DVD Video discs DVD-5 or DVD-9 as well as commercial cd's