Cisco Packet Tracer is a powerful network simulation tool developed by Cisco Systems, designed for learning, practicing, and visualizing computer networks, IoT, and cybersecurity concepts. It offers a virtual environment to create, configure, and troubleshoot network topologies with drag-and-drop simplicity, making it ideal for students, educators, and IT professionals. Also known as a network simulator, Packet Tracer supports multi-user collaboration and real-time protocol simulation.