Hydraulic systems refer to mechanical systems that use pressurized fluid to transfer force from one point to another. This type of system is commonly used in industrial and manufacturing applications as a means of transmitting power. In the context of semiconductor equipment manufacturing, hydraulic systems can be used to control and power various types of machines, such as handling systems, transfer systems, and loading systems. These hydraulic systems can be designed to provide precise, controlled motion, making them an important component in many stages of the semiconductor manufacturing process.