Network simulators are software tools that mimic the behavior of computer networks. They allow users to create virtual network environments to test and analyze various network configurations, protocols, and performance without the need for physical hardware. This helps in understanding how different components interact and can be useful for educational purposes, research, and network design. These simulators can model various network scenarios, including local area networks (LANs), wide area networks (WANs), and even cloud networks. By using network simulators, engineers and students can experiment with different setups, troubleshoot issues, and optimize network performance in a risk-free environment.