A hydraulic lift is a device that uses fluid pressure to raise or lower heavy objects. It operates 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. Commonly used in garages and construction sites, hydraulic lifts can elevate cars, machinery, and other heavy loads. They are essential for tasks that require lifting, such as vehicle maintenance or transporting materials, enhancing safety and efficiency in various industries.