A Digital-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 that require real-world outputs, like sound or video. DACs are commonly used in devices like smartphones, televisions, and audio equipment. They enable the playback of digital audio files by converting the digital data into an analog signal that can drive speakers or headphones, allowing users to hear music and other audio content.