Meaning – A coaxial cable is a special kind of electrical cable, that is used to transmit signals. This cable features a thin conducting wire, surrounded by a layer of insulating material, followed by a layer of conducting material, and finally, an insulating mantle.
Such cables are used as a high-frequency transmission line to carry a high-frequency or broadband signal. Because the electromagnetic field carrying the signal exists (ideally) only in the space between the inner and outer conductors, it cannot interfere with or suffer interference from external electromagnetic fields.
Coaxial cables have certain limitations which cause them to be replaced by alternatives such as a fibre optic cable, category cable and sometimes, even wireless signals.
Example of usage – “Coaxial cable is commonly used by cable operators, telephone companies, and internet providers around the world to convey data, video, and voice communications to customers.”