Low-pass filtering is a technique used in signal processing to allow low-frequency signals to pass through while attenuating (reducing) the strength of higher-frequency signals. This is useful in various applications, such as audio processing, where it helps to remove unwanted noise and smooth out signals. In digital systems, low-pass filters can be implemented using algorithms that average data points over time, effectively reducing rapid fluctuations. This method is commonly applied in devices like smartphones and audio equipment to enhance sound quality and improve overall performance by focusing on the essential low-frequency components of a signal.