CD-ROM stands for "Compact disk-read only memory" is very much like a floppy disk/diskette which data is imprinted via a laser process. The user is not able to change or write over the disk, the user can only "read" from it. Such examples include music disks, programs and games.
Music can be played on your computer by placing a CD-ROM into the CD-ROM Drive as shown above in the picture. Click here to hear some music.