Here's why:
* Modulator: This part of the modem takes digital data (like the information you see on a website) and converts it into analog signals (waves that can travel over telephone lines or other communication channels).
* Demodulator: This part of the modem does the opposite. It takes the analog signals received from the communication channel and converts them back into digital data that your computer can understand.
So, a modem basically modulates and demodulates signals to allow your computer to communicate with other devices over a physical connection.