This paper describes the recent development of Magneto-Rheological Fluids, devices and systems. MR technology became commercially available for automotive, industrial vehicles, civil engineering applications. Shock absorbers for primary suspension of passenger cars and damper for driver's seat suspension of large vehicles, are the examples, which have proven its performance of instantaneous vibration mitigation and control, robustness and durability. The application is expanding to new areas like prosthetic, seismic control and tactile feedback devices.