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CDs (compact discs) were like DVDs, except they held less data: only about 700 MB. While media such as computer software was sold on CD, in the form of so-called "CD-ROMs," the primary commercial use of the compact disc was to distribute music in the days before everything was supplied digitally via the Internet. Back then, you generally couldn't just buy a single song you liked, unless it was specifically made available on a "single" CD. You had to buy the whole album. And it cost like $15.

DVDs (digital versatile discs) were like Blu-Rays, except not HD.

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