A cable made by intertwining two separate insulated wires together. There are two twisted pair types: shielded and unshielded. Shielded Twisted Pair (STP) has a fine wire mesh surrounding the wires to protect the transmission; Unshielded Twisted Pair (UTP) does not. Shielded cable is used in older telephone networks, network, and data communications to reduce outside interference. The illustration gives an example of what the inside of these cables look like.