Hydraulic lifts are devices that use fluid pressure to raise and lower heavy objects. They operate based on Pascal's principle, which states that pressure applied to a confined fluid is transmitted equally in all directions. This allows a small force applied to a small piston to lift a larger load on a bigger piston, making it easier to move heavy items. These lifts are commonly used in various settings, including automobile repair shops, construction sites, and elevators. They can handle significant weight and are essential for tasks that require lifting, such as transporting goods or providing access to different building levels.