Which device is used to convert digital signals into analog and vice versa?

Explanation

Modems: Converting Digital Signals for Analog TransmissionA modem (modulator-demodulator) is a device that modulates (converts) a digital signal into an analog signal for transmission over analog communication channels like telephone lines or cable TV lines. It also performs the opposite function by demodulating (reconverting) the received analog signal back into a digital signal for the receiving device to understand.In the past, modems were essential for connecting computers to the internet over telephone lines. As internet access has shifted towards fiber optic cables and other digital technologies, the need for traditional modems has diminished. However, modems are still used in some specific applications, such as dial-up internet access and communication over legacy analog infrastructure.