Hydraulics is a study of liquids that are in rest, under pressure and control of machines. For example if we pull a object from one end it is transferred to the other end by the use of liquid. The liquid used is oil always the force is double when we use hydraulics.
In most of the system the hydraulics cylinder and piston are use to pull out the oil.
It is also very important to note hydraulics will not contains any air bubbles. If there is an air bubble in the system, then the force applied to the first piston gets used compressing the air in the bubble rather than moving the second piston, which has a big effect on the efficiency of the system.
The best example is car brake. The brakes in your car are a good example of a basic piston-driven hydraulic system. When you depress the brake pedal in your car, it is pushing on the piston in the brake's master cylinder. Four slave pistons, one at each wheel, actuate to press the brake pads against the brake rotor to stop the car.
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