Answer / kokila & parsana

In modulation ,characteristics of the carrier signal is
varied in accordance with the amplitude of the message signal.
Whereas in demodulation, the message signal is extracted
from the carrier signal.

Answer / shanthi

Modulation is the process where a Radio Frequency or Light
Wave's amplitude, frequency, or phase is changed in order to
transmit intelligence. The characteristics of the carrier
wave are instantaneously varied by another "modulating"
waveform.

Answer / madanreddy

Modulation= Original Signal(I/P)+Carrier Signal
Demodulation= Original Signal(Input Signal)
or
Demodulation= Modulation-Carrier Signal

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