Router: A router is a device that forwards data packets between computer networks. It is connected to two or more networks, such as the Internet and a local area network (LAN). Routers use headers and forwarding tables to determine the best path for forwarding the packets, and they use protocols such as ICMP to communicate with each other and configure the best route between any two hosts. Modem: A modem is a device that modulates an analog signal to encode digital information,