A nozzle is a device that controls the flow of a fluid, such as air or water, by changing its direction or speed. You can find nozzles in many everyday items, like garden hoses and spray bottles. They help create a focused stream, making it easier to water plants or clean surfaces effectively. In the world of engineering, nozzles are crucial in various applications, including jet engines and firefighting equipment. By shaping the flow of gases or liquids, nozzles enhance performance and efficiency, allowing for better control and precision in tasks like propulsion or extinguishing fires.