Hydraulic pressure refers to the force exerted by a fluid in a confined space. It is generated when a liquid, such as water or oil, is pushed through a system, creating pressure that can be used to perform work. This principle is commonly utilized in various applications, including hydraulic machinery and automotive brakes. The pressure in a hydraulic system is measured in units like pascals (Pa) or pounds per square inch (psi). According to Pascal's principle, when pressure is applied to a confined fluid, it is transmitted equally in all directions. This allows hydraulic systems to lift heavy loads or operate machinery efficiently.