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CD-ROMs are popularly used to distribute computer software
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CD-RW (Compact Disc-ReWritable) is a rewritable optical disc. It was introduced in 1997. It was preceded by the CD-MO, which was never commercially released. CD-RW disc require a more sensitive laser optics.
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DVD is an optical disc storage format, invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995. DVDs are used in DVD-Video consumer digital video format and in DVD-Audio consumer digital audio format.
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A DVD-RW disc is a rewritable optical disc, ability to erase and rewrite to a DVD-RW disc.
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Blu-ray Disc refers to the blue laser used to read the disc. Toshiba, the main company that supported HD DVD