Signal conversion is the process of changing one type of signal into another. This is often necessary in communication systems where different devices use different formats. For example, an analog signal, which varies continuously, can be converted into a digital signal, which uses discrete values, allowing for easier processing and transmission. In many applications, such as audio and video equipment, signal conversion ensures compatibility between devices. A common example is a digital-to-analog converter (DAC), which transforms digital audio files into analog signals that can be played through speakers. This conversion is essential for seamless communication and functionality in modern technology.