Compact Disc (CD) - Digital Audio and Data Storage Media #3318235 (License: Personal Use)

This image shows a standard 120 mm optical compact disc (CD), featuring a polycarbonate substrate with a reflective aluminum layer and protective lacquer. The rainbow-like iridescence results from light diffraction off the spiral track of microscopic pits encoding digital data. CDs were widely used for music, software distribution, and data backup from the 1980s through the early 2000s.

This image is typically used on tech history pages, digital media explainers, or product documentation for optical storage. It serves users seeking to understand CD technology, compare storage formats, or identify physical media types.