A jet nozzle is a device that directs the flow of fluid, typically air or water, to create thrust or propulsion. It is commonly used in various applications, including jet engines, rockets, and water jets. By narrowing the flow path, a nozzle increases the fluid's velocity, allowing it to exit at high speed. In aerodynamics, jet nozzles play a crucial role in enhancing the performance of aircraft. They can be designed to adjust the direction of the jet, providing better control and maneuverability. Different types of nozzles, such as converging and diverging, are used depending on the specific requirements of the system.