A computer network, often simply referred to as a network, is a collection of computers and devices interconnected by communications channels that facilitate communications and allows sharing of resources and information among interconnected devices.^[1] Put more simply, a computer network is a collection of two or more computers linked together for the purposes of sharing information, and resources, among other things. Computer networking or data communications(Datacom) is the engineering discipline concerned with computer networks. Computer networking is sometimes considered a sub-discipline of electrical engineering, telecommunications, computer science, information technology and/or computer engineering, since it relies heavily upon the theoretical and practical application of these scientific and engineering disciplines.

Source: www.wikipedia.org