Fiber optics is a transmission medium commonly used in data networks; a very fine thread of transparent material, glass or plastic materials, through which pulses of light are sent that represent the data to be transmitted. The light source can be laser or LED.  
 Fibers are widely used in telecommunications, since they allow sending large amounts of data over a great distance, with speeds similar to those of radio and higher than those of conventional cable. They are the transmission medium par excellence as they are immune to electromagnetic interference, they are also used for local networks, where it is necessary to take advantage of the optical fiber over other transmission media (source and more information: wikipedia ).
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