Answer:

A CD-R (Compact Disc - Read) is designed to be written to one time and the data be stored permanently (in some cases, the data can be erased, but the CD becomes worthless).

A CD-RW (Compact Disc - Read/Write) can be erased and written to multiple times (much like the old cassette or VHS tapes. They can be erased and rewritten multiple times).

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