Compact Disk Rewritable, n.: A CD that you can burn with various amounts of data multiple times or erased unlike a CD-R which can only be burned once and cannot be erased.
CD-RW have a much higher cost than CD-R's and slower burning rates and thus less used.
I prefer to use CD-RW for work because I can reuse them, but for permanent things I like to use CD-R.
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