What is Data Communication ?
The way we live, data communication and networking changes day by day. Nowadays human life relay on computer networks and inter-networks. We need to know how the network is operate and what type of technologies are available. When we communicate we sharing the information. This sharing can be of two types: local or remote. When we communicate face to face we share the information through local while remote communication takes place over distance. For remote communication we refer the word telecommunication. It includes telephony, telegraphy television means communication at distance. The word data refer to any information presented in whatever form such as text, audio, video etc. Data communication is the exchange of data between two devices through some form of medium. This medium can be a wire cable. For data communication, communicating devices must be part of a communication system made up of combination of physical equipment i.e. hardware and programs i.e software. D