A "mute button" is a feature found on various devices, such as televisions, computers, and smartphones, that allows users to temporarily silence audio. This function is useful in situations where sound is not desired, such as during meetings, while watching a movie, or when receiving a phone call. When activated, the mute button stops all sound output, making it easy to control audio without adjusting the volume. Many devices indicate when they are muted with a visual cue, such as a symbol or a light, ensuring users are aware that sound is turned off.