What is the primary function of a modem in digital communications?

The primary function of a modem in digital communications is to convert signals between digital and analog formats. This conversion is crucial because digital devices, such as computers, use binary data (1s and 0s), while traditional phone lines and many types of wireless communication systems operate on analog signals.

When data needs to be transmitted over these analog mediums, the modem modulates the digital signals from the computer into analog signals suitable for transmission. Upon receiving the signal, the modem demodulates it, converting the analog signal back into digital format so the receiving device can understand and process the information. This conversion process enables seamless communication between digital devices and analog communication systems, making the modem essential for internet connectivity and various forms of data transmission.

In contrast, the other options do not accurately describe the fundamental role of a modem. Storing data is typically a function of storage devices, connecting multiple devices is more aligned with networking hardware like routers and switches, and amplifying signal strength is related to repeaters or signal boosters rather than the primary role of a modem.