Modulation is the addition of information to an electronic or optical carrier signal.
In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, the carrier signal, with a modulating signal that typically contains information that is to be transmitted.
There are three basic types of modulation, amplitude modulation, frequency modulation, and phase modulation.
The amplitude modulation is a type of modulation where the amplitude of the carrier signal is changed in proportion to the message signal while the frequency and phase are kept consistent.
