Fluid power is the utilization of fluid or gas under pressure to generate, control, and transmit power. It can be divided into two major categories: Hydraulics is using liquid such as oil or water, whereas Pneumatics is using air or other gases. Hydraulic or Pneumatic cylinders and motors are commonly utilized in industrial application and in our daily lives.

In industrial application, example such as earthmoving equipment manufacturing companies like Caterpillar, Komatsu, and Bobcat use hydraulic system on loaders and excavators to complete work on construction site. In our daily lives, application of hydraulic system can easily be encountered in office chairs and barbershop chairs.