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 different types of networks, such as a home network to the internet, allowing devices like computers and smartphones to communicate with each other and access online resources. In addition to directing traffic, routers often provide security features, such as firewalls, to protect the network from unauthorized access. They can also offer additional functionalities, like Wi-Fi connectivity, enabling wireless devices to connect to the network without physical cables.