Definition:
Optical media is a generic term that refers to any type of data storage media that uses light, usually in the form of a laser, to read and/or write data. The term most often refers to CDs, which can hold 650-800 MB of data; single-layer DVDs, which can hold up to 4.5 GB of data; and dual-layer DVDs, which can hold up to 9 GB of data.
Examples:
The three most popular types of backup media for home and home office users are hard drives, optical media (such as CDs or DVDs), and online file storage services.
