Fluid power is the use of pressurised liquids or gases to generate, control, and transmit mechanical power. There are two main types of fluid power: hydraulic systems, which use liquids such as oil, and pneumatic systems, which use compressed air. Hydraulic systems are commonly used in machinery such as excavators, hydraulic presses, and forklifts because they can produce large amounts of force, while pneumatic systems are often used in air tools, factory automation, and packaging machines. Fluid power systems are useful because they provide high force and power, smooth motion, and precise control, although they can require regular maintenance and may have issues such as fluid leaks or energy loss.