The ns-3 Project is an open-source discrete-event network simulator designed for research and educational purposes. It offers a comprehensive environment for simulating a wide range of network protocols and topologies. The simulator is developed to be highly capable, providing simulation models that offer accurate representations of real-world network behavior. It supports Unix-based operating systems and is extensible, allowing users to incorporate new protocols and technologies. ns-3 is widely used in academia and industry for performance evaluation, network research, and protocol testing.