Which one is related to modulator and demodulator
Modem is related to modulator and demodulator.
A modem is a hardware device that allows a computer to send and receive information over telephone lines by converting digital data into an analog signal used on phone lines.
Modulation: the process of transforming digital information (1's and 0's) into analog signals.
Demodulation: the process of transforming analog signals, previously modulated, back into digital information.