Wire or cable is a term used to describe an electrical conductor, usually made of copper or aluminum, that is used to transmit electricity. It is commonly used in the construction of buildings, for wiring in appliances, and for connecting electronic components. Wire or cable can also be used to connect two or more pieces of equipment, such as computers or other electronic devices. Wire or cable is also used in telecommunications, for transmitting data and voice signals. In short, wire or cable is an essential component of any electrical system.