Cladding fiber is a thin layer of glass or plastic that covers the core of the fiber cable. These cables are used mainly for digital audio connections between devices. A fiber-optic cable, also known as an optical-fiber cable, is an assembly similar to an electrical cable but containing one or more optical fibers that are used to carry light. The optical fiber elements are typically. Fiber optic cable typically looks like a thin, flexible plastic or rubberized cord, often vibrantly colored, containing a hair-thin glass core that transmits light. Fiber optic cables are noticeably slimmer and lighter than their copper counterparts. Each fiber is thinner than a human hair, yet it carries data as pulses of light across enormous distances.