Wires and cables mainly include bare wires, high temperature cables and electrical insulation cables for motors, low voltage cables, power cables and optical cables. Electric package refers to the material used for transmission and distribution, communication and related data transmission purposes. There is no strict line between "wire" and "cable". Generally speaking, products with few cores, small cross-section area and simple structure are called wires, bare wires without insulation are called cables, others are called cables; conductors with large cross-section (greater than 6 square millimeters) are called large wires, smaller ones (less than or equal to 6 square millimeters) are called small wires, and insulated wires are also called wiring. Cables mainly include bare wires, electromagnetic wires and insulated cables for motor and electrical appliances, high voltage cables, communication optical cables and power cables. Cables include high voltage cables, variable frequency cables, compensation cables, shielded cables, high temperature cables, computer cables, signal cables, coaxial cables, refractory cables, marine cables and so on. They are all composed of multiple transmission lines, which are used to connect integrated operational amplifiers, electrical and so on.