Question

what do you mean by modulation of a signal?mention different type of modulation

Answer 1

In electronics, modulation is the process of
varying one or more properties of periodic waveform called carrier signal
with a modulating signal
that typically contains information
to be transmitted

Answer 2

In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.

Hey I'll edit the question later and answer your second question also....plz wait for sometime.....and plz don't delete my answer.