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Coaxial cable, also known as "coax", makes use of 1 wire. There is a copper wire in the middle of the cable that is used for information transmission. About it, there is an insulator that stops the copper cable from touching the braided defend layer. If the copper main touched the defend layer, the signal would get scrambled or there could be an electrical short, so the insulator prevents that. The braided metal shield is to maintain outdoors interference to a minimal. The interference, or noise, that occurs from other equipment like lights, motors, or any electrical gadget, can interfere with the signal in the copper main. The defend conducts the noise as it comes near the cable, and it is grounded.