A limiter is a device or circuitry that is designed to limit, control or regulate something. In audio equipment, for example, it refers to an electronic component used in mixing consoles and other sound reinforcement systems to prevent overloading and distortion of the amplifiers by reducing the level of the signal when it exceeds a certain threshold. Similarly, in photography, a limiter is a feature that restricts the exposure range of a camera, ensuring that images are not over or under exposed. In essence, a limiter acts as a safeguard to prevent damage or errors caused by excessive input or output levels.