Hydraulic couplings are mechanical devices used to connect two shafts in a hydraulic system, allowing for the transfer of power and motion. They help to transmit torque while accommodating misalignment and reducing vibration, which enhances the efficiency and longevity of the system. These couplings are commonly found in various applications, including construction equipment, industrial machinery, and automotive systems. By using hydraulic fluid, they can effectively manage the energy transfer, making them essential components in many hydraulic systems.