LANs, WANs and Intranets Communication is a characteristic that sets human beings apart from the other animals. History is full of improvements in how we communicate with each other. An important improvement made to computers is their capability to communicate with other computers. Today, the communication links established between PCs enable these smaller, less powerful computers to challenge the mighty mainframe computers in doing many tasks. A group of PCs working together is as powerful as a computer many times larger and faster.