A data storage medium using light to record and retrieve information from a flat, usually circular, disc. These discs typically consist of a polycarbonate substrate coated with a reflective material. Information is encoded by creating microscopic patterns on the surface, which are then read by a laser beam. Common examples include compact discs (CDs), digital versatile discs (DVDs), and Blu-ray discs.
This technology offered significant advantages over earlier magnetic storage methods in terms of storage capacity, durability, and portability. Its development revolutionized the distribution of music, movies, and software. Its use allowed for mass production and distribution of digital content, impacting entertainment, education, and data archiving.
