Answer : Booting is a process that loads the operating system when a user starts the computer. This requires a media from which the BIOS will load the operating system into RAM . The media can be a CD / DVD , hard disk drive , pen drive / USB , stick or floppy disk. All of these media that can be used to boot a computer are called bootable CDs. So , the CD from which the computer can be booted is called bootable CD.