Fiber optics is a technology wherein transmission of messages or information by light pulses along hair-thin glass fibers.

Cables of optical fibers can be made smaller and lighter than conventional cables using copper wires or coaxial tubes, yet they can carry much more information, making them useful for transmitting large amounts of data between computers and for carrying data-intensive television pictures or many simultaneous telephone conversations.

Optical fibers are immune to electromnagnetic interference and to crosstalk from adjoining wires, and tapping into them is more easily detected. They also require fewer repeaters over a given distance than copper wire does to keep a signal from deteriorating.

In addition to communications, optical fibers are used to transmit light in autimobiles, aircraft, medical equipment, etc.,