A Router is a device that determines the next point a data packet needs to be forwarded to on to its destination. The router is connected to more than one network and determines where each data packet should be sent based on its current understanding of the networks it is connected to. Routers have table which shows the available routes and decides based on this table what the best route is for a given packet of information.
A router operates in level 3 of the OSI model.
If you have a cable modem or DSL modem at home, you probably have a router between your internal network and Internet.
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