router

A router is a computer and networking device that forwards data packets between computer networks, including internetworks such as the global Internet.

Routers perform the traffic directing functions on the Internet. A router is connected to two or more data lines from different IP networks. When a data packet comes in on a line, the router reads the network address information in the packet header to determine the ultimate destination. Then, using information in its routing table or routing policy, it directs the packet to the next network on its journey. A data packet is forwarded from one router to another through an internetwork until it reaches its destination node.