The device that converts a digital signal into an analog signal is called a Bit Digital to Analog Converter (DAC). This device takes in digital data, which is represented by binary code (bits), and translates it into an analog signal, allowing the information to be used in various applications. In a DAC, the input bits are converted into a continuous voltage or current that corresponds to the original digital value. This process involves amplifying and smoothing the output signal to produce a clean and stable analog waveform. The accuracy of the conversion depends on the resolution of the DAC, which is determined by the number of bits used to represent the digital data. DACs are widely used in various fields, including audio processing, medical equipment, and telecommunications. They play a crucial role in converting digital information into a format that can be easily processed and utilized by analog systems or devices.