Write two basic modes of communication

Write two basic modes of communication. Explain the process of amplitude modulation. Draw a schematic sketch showing how amplitude modulated signal! is obtained by superposing a modulating signal over a sinusoidal carrier wave.

Two basic modes of communication are
(i) Point - to - point
(ii) Broadcast
In amplitude modulation, the amplitude of a carrier wave is made to vary, with time, in the same way as the modulating signal varies with time.