Hydraulic devices use fluid power to perform work. They operate on the principle of Pascal's law, which states that pressure applied to a confined fluid is transmitted equally in all directions. Common examples include hydraulic lifts, which raise heavy objects, and hydraulic brakes in vehicles, which help stop the car by applying pressure to the brake pads. These devices are widely used in various industries, including construction, manufacturing, and automotive. They are valued for their ability to generate significant force with relatively small input, making tasks easier and more efficient. Other examples of hydraulic devices include hydraulic presses and excavators.