A "low-pass" filter is a device or process that allows low-frequency signals to pass through while blocking higher-frequency signals. This is commonly used in audio processing, where it helps to remove unwanted high-frequency noise, making the sound clearer and more pleasant. For example, a low-pass filter can enhance the bass in music by allowing the deeper sounds to come through while reducing the sharper, higher notes. In electronics, low-pass filters are essential in various applications, including signal processing and communication systems. They help to smooth out signals, ensuring that only the desired low-frequency components are transmitted. This is crucial for maintaining the quality of audio and video signals in devices like speakers and televisions.