Viscous dampers are devices used to reduce vibrations and oscillations in structures, such as buildings and bridges. They work by using a fluid that flows through a piston, creating resistance against movement. This resistance helps to absorb energy from dynamic forces, like wind or earthquakes, improving the stability and safety of the structure. These dampers are commonly found in engineering applications, particularly in seismic design. By incorporating viscous dampers, engineers can enhance the performance of structures during extreme events, minimizing damage and ensuring the safety of occupants.