A hydraulic spring is a type of spring that uses fluid pressure to provide resistance and support. Unlike traditional metal springs that rely on tension or compression, hydraulic springs utilize a liquid, typically oil, to create a cushioning effect. This design allows for smoother and more controlled movement, making them ideal for applications where shock absorption is crucial. These springs are commonly found in various machinery and vehicles, such as automobiles and construction equipment. They help to reduce vibrations and impacts, enhancing comfort and safety. Hydraulic springs are often used in conjunction with other components, like shock absorbers, to improve overall performance.