A Compact Disc ReWritable, or CD-RW, is a type of optical disc that allows users to write and erase data multiple times. Unlike a standard CD-R, which can only be written once, a CD-RW can be reused, making it a flexible option for storing files, music, or backups. CD-RWs use a special dye that changes its properties when exposed to a laser, enabling the data to be erased and rewritten. This technology makes CD-RWs ideal for temporary storage or for users who frequently update their data, providing a convenient way to manage digital information.