A hydraulic jack is a device used to lift heavy objects by applying force through a liquid. It operates on the principle of Pascal's law, which states that pressure applied to a confined fluid is transmitted equally in all directions. Hydraulic jacks are commonly used in automotive repair, construction, and various industrial applications to lift vehicles, machinery, and other heavy loads. These jacks come in different types, including floor jacks, bottle jacks, and scissor jacks, each designed for specific lifting tasks. They typically consist of a cylinder, a piston, and a pump mechanism. By pushing the pump handle, the user creates pressure that raises the piston, lifting the load safely and efficiently.