A hydraulic system is a mechanism that uses fluid power to transmit and control force. It consists of a fluid-filled closed circuit, typically using oil, and components such as pumps, cylinders, valves, and reservoirs. The system works by applying pressure to the fluid, which then generates force and movement. Hydraulic systems are known for their ability to exert high forces with precise control, making them useful in various applications, including heavy machinery, automotive systems, aircraft flight controls, and industrial equipment. They offer advantages such as smooth operation, high power-to-weight ratio, and the ability to transmit force over long distances.