A limiter, also known as a restrictor, is a device used to control the flow of fluids or gases in various systems. It helps maintain a specific pressure or flow rate, ensuring that the system operates efficiently and safely. Limiters are commonly found in applications like automotive engines, plumbing systems, and industrial machinery. In audio processing, a limiter prevents audio signals from exceeding a certain level, which helps avoid distortion and damage to equipment. This is particularly important in music production and broadcasting, where maintaining sound quality is crucial. Limiters are essential tools in both fluid dynamics and sound engineering.