Hydraulic springs are mechanical devices that use fluid pressure to store and release energy. Unlike traditional metal springs, which rely on tension or compression, hydraulic springs utilize a liquid, typically oil, to create force. This allows for smoother and more controlled movement, making them ideal for applications in machinery and vehicles. These springs are commonly found in systems like automobiles, construction equipment, and industrial machinery. They can absorb shocks and vibrations, enhancing performance and safety. By adjusting the fluid pressure, hydraulic springs can be fine-tuned for different loads and conditions, providing versatility in various engineering applications.