What is the function of a modem?

A modem, short for modulator-demodulator, is a device that modulates and demodulates analog signals to enable digital data to be transmitted over analog communication lines such as telephone lines. The primary function of a modem is to convert digital data from a computer or network into analog signals for transmission over a communication line, and then to convert incoming analog signals back into digital data for use by the receiving device.

Modems are commonly used to provide internet access, connect to remote servers, and facilitate communication between devices over telephone lines or other analog communication channels.