A coaxial cable has a distinctive layered construction: a central conductor, surrounded by an insulating layer (the dielectric), then a conductive shield (braid or foil), all wrapped in an outer sheath. The conductor and shield share the same central axis — which is what 'co-axial' means.
That shield is the key feature: it surrounds the signal conductor and blocks external electromagnetic interference, so coaxial cable carries high-frequency video and radio-frequency (RF) signals cleanly over distance. This makes it ideal for television, surveillance and signal feeds.
Coaxial construction is used in APAR's CATV (cable television) and CCTV (surveillance) cables. See what communication cables are used for for the wider family, or browse the full communication cables range.