Coaxiale Cable 

It's called coaxial because it has one core with in another core.

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In the picture above, you can see the outer braided wire surrounding the heavily sheathed inner core. The braided wire typically carries picture data while the inner core carries sound data.

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In the home, co-axial cables are often connected using screw on type fittings. The use of crimp type connectors is much more prevalent where the connection may be outside and needs to be secure and possibly weatherproof.

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There are two main types of coaxial crimp connectors; BNC and TNC.

BNC (beyonette Neill-concelman) Connector, which is a common type of RF (radio Frequency) connector.

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The BNC connector is used for RF signal connections, both for analogue and digital video signals (for example CCTV systems), amateur radio antenna connections, aviation electronics (avionics) and on nearly every piece of electronic test equipment manufactured in the last 35 years.

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TNC (threaded Neill-concelman) It is a threaded version of the BNC connector, and has better performance than the BNC connector at microwave frequencies.