This document discusses communication and computer networks. It defines communication as the exchange of information between individuals using various methods. It then explains that for communication to occur, there must be established protocols that govern elements like senders, receivers, methods of transmission, and message formats. The document also summarizes the basic components of a computer network, including rules/protocols, messages, transmission mediums, and devices. It emphasizes that for networks to function properly, strict protocols must be in place to control the communication processes.