What is the use of a computer network cable?

A data cable is any media that allows baseband transmissions (binary 1,0's) from a transmitter to a receiver.

Category 5 cable (Cat 5) is a twisted pair high signal integrity cable type. This type of cable is used in structured cabling for computer networks such as Ethernet and ATM, and is also used to carry many other signals such as telephony and video. Most Category 5 cables are unshielded, relying on the twisted pair design for noise rejection. Category 5 has been superseded by the Category 5e specification.