RW stands for rintek wu'uk (smooth hair, smooth fur), an euphemism for "dog meat" in Northern Celebes
It used to be easy to find restaurants who cook and sell RW, however, due to government and SJWs go hand in hand to eradicate dog meat consumption, RW is becoming a rare item right now
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.