What is Modulation & Demodulation ? Why Modulation is Required ? || Communication system

In this video, what is modulation, why the modulation is required in communication and concept of Demodulation are explained briefly.
Explained with few analogies for better understanding of the role of modulation in communication.
Modulation is the process where one of the properties of the Carrier signal like amplitude, phase or frequency changes according to the Message or Modulating signal.
Why Modulation is Required in Communication
1) To reduce antenna size
2) To reduce the interference
3) To allow the multiplexing of the different signals
Classification of Communication System : • Classification of Comm...
Classification of Signals : • Classification of Sign...
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[@chirantarbhattacharjee2822]

very informative.. all the points you should know in just one video..

[@rajendranr3856]

What about demodulation