To know what is hydraulic fluid, first we have to understand it well Hydraulic fluid is a specialized oil used in hydraulic machinery to transmit power. It plays a crucial role in systems like brakes, steering, and lifts by transferring force when pressurized. The fluid must resist oxidation, maintain viscosity, and lubricate components to ensure efficient operation and longevity of equipment. Its ability to withstand high pressure and varying temperatures makes it essential in a wide range of industrial and automotive applications.