A network cable is used to establish a physical connection between different network devices, such as computers, routers, switches, and servers. It allows these devices to communicate with each other and share information through a wired network infrastructure. Network cables transmit data signals in the form of electrical impulses, allowing for fast and reliable data transmission over local area networks (LANs) or wide area networks (WANs). Different types of network cables, such as Ethernet cables, fiber optic cables, and coaxial cables, are used depending on the specific network requirements and performance needs. Overall, network cables serve as the backbone of modern communication systems, enabling seamless connectivity and data exchange in various digital environments.