Data communication is the exchange of electronic or digital data between two or more nodes via some form of transmission medium regardless geographical location. Two types of data communication are there such as local and remote. If the communicating devices are in the same building then it is known as local communication and if the devices are farther apart then it is known as remote communication. The components of data communication are message, sender, receiver, medium, protocol. Message means information to be communicated. Sender and receiver are the devices that send and receives data message. Medium is the physical path used to transmit message from sender to receiver and receiver to sender. Protocol means set of rules that guide data communication. To know details about data communication you check the sites listed here and if you would like to list here your own website then your website receives worldwide coverage.