Is it ensure, insure, or assure?
(UTP) Normal telephone wire (in the USA). It may be used for computer to computer communications, e.g. using a version of Ethernet or localtalk. It is much cheaper than standard "full-spec" Ethernet cable. It comes in five "catagories":
cat. wires transmission 1 two voice no data (telephone cable) 2 four data up to 4 Mbps 3 four data up to 10 Mbps 4 four data up to 16 Mbps 5 four data up to 100 Mbps