A type of cable commonly used in Ethernet networks, consisting of twisted pairs of insulated copper wires without additional shielding.

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Unshielded twisted-pair cables are Ethernet cables that use pairs of insulated copper wires twisted together and have no additional shielding around the pairs. This type is the most common for Ethernet today (think Cat5e, Cat6, Cat6a). The twisting helps reduce crosstalk, and the lack of shielding keeps the cable inexpensive and flexible, which is ideal for typical office environments and standard network speeds. Shielded twisted-pair adds protective foil or braid to combat interference, which is useful in high-EMI areas. Coaxial cable is an older Ethernet medium with a single conductor and shielding, while optical transmitters refer to fiber optics, not copper wires. So the description points to unshielded twisted-pair.