How are computers physically linked What is the most common type of material to do this?

Computers are physically linked through various types of cables and connectors that facilitate communication and data transfer. The most common type of material used for these connections is copper, often in the form of twisted pair cables (like Ethernet) or coaxial cables. Fiber optic cables, which use glass or plastic fibers to transmit data as light, are also widely used, particularly for high-speed and long-distance connections. These materials enable efficient transmission of electrical signals or light signals between devices.