A low-pass filter is an electronic device that allows signals with a frequency lower than a certain cutoff frequency to pass through while attenuating (reducing) the strength of signals with higher frequencies. This makes low-pass filters useful in various applications, such as audio processing, where they can help remove unwanted high-frequency noise from sound recordings, ensuring a clearer listening experience. In the context of signal processing, low-pass filters can be implemented using different methods, including analog circuits and digital algorithms. They are commonly used in music production, telecommunications, and even in image processing to smooth out data and enhance the quality of the output.