Smart fluids are materials that can change their properties in response to external stimuli, such as magnetic or electric fields. These fluids can become more viscous or solidify when a force is applied, making them useful in various applications, including automotive systems and robotics. One common type of smart fluid is ferrofluid, which contains tiny magnetic particles suspended in a liquid. When exposed to a magnetic field, ferrofluids can form spikes and patterns, demonstrating their unique behavior. This property allows them to be used in applications like seals, dampers, and even artistic displays.