A digital-to-analog converter (DAC) is an electronic device that transforms digital signals, which are represented as binary numbers, into analog signals. These analog signals can take various forms, such as voltage or current, and are essential for applications like audio playback, where digital music files need to be converted into sound waves that we can hear. DACs are commonly used in devices like smartphones, computers, and televisions. They play a crucial role in ensuring that digital content, such as music or video, is accurately represented in the analog world, allowing users to experience high-quality sound and visuals.