Multiple copies of a Compact Disc (CD) can be made through the process of duplication or replication (also known as "manufacturing"). The information is typically taken from a video tape or audio tape master and used to make a copy that is called a “dub” or "disc master". CDs are commonly used to store audio files, digital information, video and photographic images, and other documents. The process of placing information on a compact disc by means of a laser beam ("burning a cd") is called duplication. CD’s have evolved into a versatile media that includes CD-R’s and CD-RW’s (re-writeable media that makes it possible to create multiple “burns” onto the same CD). Compact discs provide superior quality, portability, and versatility to their predecessor, the floppy disc.