what is difference between fibre optic cable and coaxial cable?

 Coaxial cable contains copper surrounded by a thin layer of foil and a thick coat of flexible plastic to protect it from interference, according to TechTarget. Optical fiber employs a similar setup, but contains a form of glass because it transmits data using light. Some other metallic wire, such as telephone, uses little shielding over copper wire.The glass used in fiber optic cable costs less than copper. Also, fiber optics use light to carry data--the fastest speed in the universe and many times faster than metallic cable, which use sound waves or electrical signals.