Hydraulic machinery uses pressurized fluid to perform work, making it essential in various industries such as construction and manufacturing. By converting hydraulic energy into mechanical energy, these machines can lift heavy loads, operate machinery, and perform tasks that would be difficult or impossible with manual labor. Common examples of hydraulic machinery include excavators, forklifts, and hydraulic presses. These machines rely on the principles of hydraulics, where the force applied to a fluid in a confined space is transmitted equally in all directions, allowing for efficient and powerful operation.