Electrical wires and cables are engineering materials used for transmitting electrical energy and signals, widely applied in various fields. The main uses of electrical wires and cables are as follows:

1. Power Transmission: The most basic and primary use of electrical wires and cables is power transmission. In power systems, electrical wires and cables are responsible for transmitting electrical energy from power generation facilities to various power consuming devices. Whether it's household electricity or large-scale industrial electricity, it relies on electrical wires and cables to achieve power distribution and transmission.
2. Signal Transmission: In addition to transmitting electrical energy, electrical wires and cables are also used to transmit signals. For example, in telephone, network, television, and broadcasting systems, signals are transmitted through electrical wires and cables. These signals can be audio, video, data, or other types of signals, and rely on stable cable connections to ensure transmission quality.
3. Building Wiring: Within buildings, electrical wires and cables are used for wiring in various systems such as lighting, air conditioning, security systems, and fire systems. Building wiring needs to consider aesthetics, safety, and convenience, so high-quality electrical wires and cables and wiring techniques are required.
4. Industrial Automation: In manufacturing, robotics, and other automated applications, electrical wires and cables are important components connecting various devices and sensors. These cables need to withstand harsh environments and mechanical stress, so they usually adopt durable and flexible designs.
5. Transportation Facilities: Electrical wires and cables are also widely used in transportation facilities such as railways, highways, aviation, and ships. For example, the signaling and control systems of railways rely on electrical wires and cables for communication and power transmission.
6. Communication Networks: In modern communication networks, electrical wires and cables are the infrastructure for building the Internet, telephone networks, and cable television networks. These networks require high-speed and stable transmission capabilities, so the quality and performance requirements for electrical wires and cables are very high.

In short, electrical wires and cables are indispensable in modern society. Their applications are very wide-ranging, covering almost all fields, including residential, commercial, industrial, and transportation. Whether transmitting electrical energy or signals, electrical wires and cables play a crucial role in ensuring the normal operation and communication of various systems. Therefore, the selection, installation, and maintenance of electrical wires and cables need to be given high importance to ensure their performance and safety.