What do you mean by a modem? Why is it used?

Q. What do you mean by a modem? Why is it used?

Answer:-

Modem stands for ‘MOdulator DEModulator’. It refers to a device used for conversion between analog signals and digital bits. We know computers store and process data in terms of 0s and 1s.
The modem at the sender’s end acts as a modulator that converts the digital data into analog signals. The modem at the receiver’s end acts as a demodulator that converts the analog signals into digital data for the destination node to understand.