Why fiber optics are so useful?

Don't get confused.
Fiber optics (FO) is a science, by which electrical energy is converted into light (or optical energy); that light is transported through optical fibers to some other place, and finally is converted again in electrical energy.
Sounds amazing that the waves along our telephone line or our cable television travel in form of light, which many times falls in the visible frequency spectrum.
The enormous advantages of the optical fiber telecommunications compared to metal wire or coaxial transmission may be summarized as follows:
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