Hydraulic refers to a liquid moving in a confined space under pressure.
Compared to a pneumatic system which uses air, if a hydraulic system fails, it is easier to spot problems during operations, such as a fluid leak.
Hydraulic fluid operates very well under extreme temperatures.
Hydraulic systems use incompressible fluid which provides an effective and consistent output. The hydraulic fluid is able to withstand heavy work loads, that resists compression and reduces energy loss.