Network Simulation is a technique used to model the behavior of computer networks. It allows researchers and engineers to create virtual environments where they can test and analyze how different network configurations and protocols perform under various conditions. This helps in understanding potential issues and optimizing network performance without the need for physical hardware. By using simulation software, users can simulate various scenarios, such as network congestion or failures, to see how data packets are transmitted. This approach is valuable for designing robust networks, training professionals, and developing new technologies in the field of computer networking.