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to connect multiple computers to the same internet connection, and to network the computers together

Routers allow multiple computers to share a single internet connection. This helps save a lot of money. Apart from this, routers also add a safety element to a local network. The individual IP addresses of the computers on the local network are never exposed to the internet. Instead only the external IP address of the router is publicly known. Moreover, many routers come with additional features like firewalls, filters and other security enhancing abilities.

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