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A router is a box that routes network information between machines. An ISP router is responsible for directing network traffic appropriately between all the ISP's customers. Routing is a standard ISP service that all ISP providers address. It is low-level though and most customers are not even aware of it so long as it continues to work properly. If an ISP router fails for some reason, people using that ISP will not be able to get e-mail, browse the Web, read Usenet, or perform any basic Internet tasks.