Coaxial cable has a central insulated conductor which may be a solid wire or stranded. It is then enclosed in a conducting layer which is usually a copper or aluminum mesh or sometimes with a solid metal sleeve. It is then covered by an outer insulator called a jacket. The earthed braid provides a barrier against EMI moving into and out of the coaxial cable.
The central core and the outer sheath share the same axis, hence they are coaxial and the cable is referred to coaxial cable or more usually just “coax”.
Coaxial cable is widely used for video and television but is not recommended for carrying data. The new standards are likely to continue its decline and possible demise.
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