(4) Interconnected

A computer network or data network is a telecommunications network that allows computers to exchange data. In computer networks, networked computing devices pass data to each other along data connections. The internet that we are using today is a large network of networks. 

Each device has an IP address. As we discussed during the second quarter, an Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. An IP address serves two principal functions: host or network interface identification and location addressing.

Data travels back and forth in a network. It is transferred physically through a communication channel or medium such as copper wires, optical fibers, wireless channel and storage devices. They are represented as electromagnetic signals such as an electrical voltage, radio wave, microwave or infrared signal.Data is divided into small pieces called packets for easy transfer. 

Transferring data from a network to another network is called internet exchange. Internet can be faster through peering.

Source: wikipedia.com