Fiber optic cables are composed of plastic and glass inner core which is surrounded by a cladding and is encased in an outside jacket. Fiber optic cables are new technology which uses optical fiber of plastic or glass threads made of 100 or more incredible thin strands of the same to transmit data. As the data is transferred through a medium of light, two things that keeps the light inside fiber optics is its core and the layer over the core which is cladding.