Which one among the following statements about ‘modem’ is correct?

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Which one among the following statements about ‘modem’ is correct?

Modem is a software
Modem helps in stabilizing the voltage
Modem is an operating system
Modem converts the analog signal into digital signal and vice versa
This question was previously asked in
UPSC CAPF – 2013
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D) Modem converts the analog signal into digital signal and vice versa
A modem, which stands for Modulator-Demodulator, is a networking hardware device. Its primary function is to convert digital signals generated by a computer or other digital device into analog signals that can be transmitted over traditional analog communication channels like telephone lines or coaxial cables (modulation). Conversely, it receives incoming analog signals from the communication line and converts them back into digital signals that the computer can understand (demodulation). This process allows digital devices to communicate over analog infrastructure.
Modems are essential for many types of internet connections, including dial-up, DSL, and cable internet. They bridge the gap between the digital world of computers and the analog nature of certain transmission media. While modern networks often use digital signals end-to-end, modems are still necessary at the interface with older or specific transmission technologies.

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