A low-pass filter is an electronic device that allows low-frequency signals to pass through while blocking higher-frequency signals. This means that sounds or signals below a certain frequency can be heard or processed, while those above that frequency are reduced or eliminated. Low-pass filters are commonly used in audio equipment to remove unwanted noise and improve sound quality. In addition to audio applications, low-pass filters are also used in various fields like telecommunications and signal processing. For example, in radio communications, they help ensure that only the desired frequencies are transmitted, enhancing clarity and reducing interference from background noise.