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A router is a networking device that helps in exchanging information between two or computer networks. Routers direct the traffic on the Internet. A bunch of data items are typically forwarded from one router to another router through the networks that constitute an internetwork until it reaches its destination.
A router is connected to two or more computers from different networks. When a packet of data comes in on one of the connections, the router reads the network address information in the packet to determine the final address. Then by using information provided as to how to direct the information, it transfers the data to the next network on the route.
http://www.allhelpnumber.com/blog/why-does-dlink-router-not-connecting-to-internet
