The block diagram of a communication system will have five blocks, including the information source, transmitter, channel, receiver and destination blocks.

1.Information source :-

• The objective of any communication system is to convey information from one point to the other. The information comes from the information source, which originates it

• Information is a very generic word signifying at the abstract level anything intended for communication, which may include some thoughts, news, feeling, visual scene, and so on.

• The information source converts this information into physical quantity.

• The physical manifestation of the information is termed as message signal

2.Transmitter :-

• The objective of the transmitter block is to collect the incoming message signal and modify it in a suitable fashion (if needed), such that, it can be transmitted via the chosen channel to the receiving point.

• Channel is a physical medium which connects the transmitter block with the receiver block.

• The functionality of the transmitter block is mainly decided by the type or nature of the channel chosen for communication.

3.Channel :-

• Channel is the physical medium which connects the transmitter with that of the receiver.

• The physical medium includes copper wire, coaxial cable, fibre optic cable, wave guide and free space or atmosphere.

• The choice of a particular channel depends on the feasibility and also the purpose of the communication system.

4.Receiver:-

• The receiver block receives the incoming modified version of the message signal from the channel and processes it to recreate the original (non-electrical) form of the message signal.

• There are a great variety of receivers in communication systems, depending on the processing required to recreate the original message signal and also final presentation of the message to the destination.

5.Destination:-

• The destination is the final block in the communication system which receives the message signal and processes it to comprehend the information present in it.

• Usually, humans will be the destination block.