Hydraulic systems are mechanisms that use liquid to transmit power. They work by applying pressure to a fluid, which then moves through pipes and actuates various components, such as cylinders or motors. This technology is commonly found in machines like excavators and forklifts, allowing them to lift heavy loads with ease. The key advantage of hydraulic systems is their ability to generate significant force in a compact size. By using incompressible fluids, these systems can efficiently transfer energy, making them ideal for applications in construction, manufacturing, and even automobiles. Overall, hydraulics play a crucial role in modern engineering and machinery.