Q.Draw the block diagram of a basic electronic communication system.

Communication is the process of exchanging information, and an electronic communication system carries that information electronically from one point to another. However simple or complex, every such system can be drawn as the same left-to-right chain of functional blocks:

with a separate noise source feeding into the channel. Each block has a clear job. The source generates the message — the information, intelligence, signal or data to be sent. The transmitter is a circuit that processes this message and launches it effectively over the channel. The channel (or medium) is the physical path the signal travels through: a wire, free space, or an optical fibre. The receiver picks the signal up from the channel and processes it back into a form suitable for the user. The destination is that end user for whom the message was meant. Finally, noise — any unwanted electrical disturbance — is added to the signal as it passes through the channel, which is why the noise block is drawn feeding into the channel.

Understanding this block model matters because it applies to every communication link — telephone, radio, television, satellite or internet — so the same five functions can be recognised in any system, no matter what technology carries the message.