A network router is a device that connects multiple computer networks and directs data traffic between them. It acts as a traffic manager, ensuring that data packets are sent to the correct destination. Routers can connect to various types of networks, including local area networks (LANs) and the internet. In addition to routing data, many routers also provide security features, such as firewalls, to protect networks from unauthorized access. They often include wireless capabilities, allowing devices like smartphones and laptops to connect without physical cables. This makes them essential for both home and business networks.