It is a CD, DVD, Blue Ray, CDR, CDi, CDRW, DVDRW, MP3, MP4, or any of a dozen other varieties of laser data readers.
Hard Disk Drive (HDD) Floppy Disk CD Disk USB Disk SD Card
blu-ray
cd, dvd, and vcd
A DVD-ROM should be able to read all formats of cd's. Including regular music cd's (CDA), CD-R (RW), DVD-R (RW).