Basic Communication Model

Communication model is used to exchange data between two parties.
For example communication between a computer, server and telephone (through
modem).
Source
Data to be transmitted is generated by this device, example: telephones, personal
computers etc.
Transmitter
The data generated by the source system are not directly transmitted in the form
they are generated. The transmitter transforms and encodes the information in
such a form to produce electromagnetic waves or signals.
Transmission System
A transmission system can be a single transmission line or a complex network
connecting source and destination.
Receiver
Receiver accepts the signal from the transmission system and converts it to a
form which is easily managed by the destination device.
Destination
Destination receives the incoming data from the receiver.