What is a CD-ROM?

A CD-ROM is a type of optical disc that can store digital data. It was first introduced in 1987 and was initially used to store software applications and data.

CD-ROMs are composed of a polycarbonate substrate and a reflective layer. The polycarbonate substrate is coated with a thin layer of aluminum, and the reflective layer is coated with a thin layer of silver. When light shines on the reflective layer, it reflects off the silver and is read by a laser.

CD-ROMs are read-only, which means that you can’t modify the data that is stored on …