Modulation
Modulation is a process of changing one or more properties in a transmitting signal (message signal) by adding noise signal (carrier signal) to it. If we transmit a signal without modulation, we can't send the signal to a long distance, for covering the more distance we must modulate the message signal before transmitting. By using the modulation technique we can secure the message,what we transmit.
Example :
If we throw a sheet of paper, it will not reach a long distance. If we want the paper to reach a long distance, then we can add some noise(unwanted) to the paper that is crushing the paper or throwing the paper with a stone in it. Now the paper reaches a long distance.
Demodulation
Demodulation is a process of removing the carrier signal what we have added in modulation.This is the process of recovering the original message signal.
By removing the stone in the crushed paper is the example of recovering the original signal, ie,) demodulation.
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