Twisted pair cabling is a type of wiring in which two conductors of a single circuit are twisted together to improve electromagnetic compatibility. Compared to a single conductor or an untwisted balanced pair, a twisted pair reduces electromagnetic radiation from the pair and crosstalk between neighboring pairs and improves the rejection of external electromagnetic interference. For additional noise immunity, twisted-pair cabling may be shielded. A cable with shielding is a shielded twisted pair (STP) and without an unshielded twisted pair (UTP).
A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. The connections between nodes are established using either physically wired, optical, or wireless radio-frequency that may be arranged in various network topologies. The best-known computer network is the Internet.