What is a key feature of coaxial cables?

Coaxial cables are distinguished by their structure, which consists of a central conductor surrounded by insulation and an outer conductive shield. This design not only facilitates the transmission of high-frequency signals but also helps in minimizing electromagnetic interference. The central conductor is typically made of copper or aluminum, allowing for excellent conductivity, while the insulating material maintains the separation from the shield, which can be made of either braided copper or aluminum foil. This shielding plays a critical role in protecting against interference from external sources, making coaxial cables particularly effective in applications like cable television and internet connections.

The option that mentions multiple pairs of wires relates more to twisted pair cables, which serve different purposes and are common in telecommunication setups. The claim of immunity to all types of interference is overly broad, as coaxial cables can still be affected by significant interference under certain circumstances, though they are more resilient compared to other types of cables. The assertion that coaxial cables function primarily in wireless networks is misleading; coaxial cables are primarily used for wired connections rather than wireless ones.