Ans. The input and output impedance of a two-port network play a crucial role in determining its performance and compatibility with other electrical systems. The input impedance determines how well the network can accept signals from the source, while the output impedance determines how well it can deliver signals to the load. Matching the impedance between the source, network, and load is important for maximum power transfer and minimizing signal distortion. By analyzing the input and output impedance, engineers can design and optimize two-port networks for specific applications.