Answer Posted / abdul quadir khumani

Modulation = the technique by some parameter of carrier are
varied in accordance with carrier frequency is called Modulation

There are mainly three need of Modulation

1. Multiplexing = many signals can be transmitted at once.
2. Narrow Banding = low bandwidth required.
3. Height of Antenna = small variation in height of antenna
while change in frequency of signals is considerable..

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