What is a coaxial cable

Coaxial cable:

A coaxial cable is a type of electrical cable consisting of an inner conductor surrounded by a concentric conducting shield ยน. It is a type of transmission line, used to carry high-frequency electrical signals with low losses. It is used in such applications as telephone trunk lines, broadband internet networking cables, high-speed computer data busses, cable television signals, and connecting radio transmitters and receivers to their antennas. Coaxial cable is characterized by having the inner conductor and the outer shield sharing a geometric axis.

Some of the key features of coaxial cables are:
Inner conductor (usually a solid copper, stranded copper or copper-plated steel wire)
Insulating layer
Shield (typically one to four layers of woven metallic braid and metallic tape)
Outer insulating jacket

Some of the uses of coaxial cables are:
Feedlines connecting radio transmitters and receivers to their antennas
Computer network (e.g., Ethernet) connections
Digital audio (S/PDIF)
Distribution of cable television signals

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