The router is the device that administrates your network. It gives each PC a unique (internal) IP for example. Some years ago, you'd usually link the router up with a switch, to which you connect all the PCs on the network. Nowadays, the ISP usually gives a router with built-in switch, or a router with a built-in wireless access point.
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The Difference Between Modems and Routers
The second piece of the home network puzzle is the router. Once you've got Internet in your home, the router is responsible for distributing the connection to the various devices in your home, while also allowing the devices to communicate with one another. Although it is certainly still possible to buy a home router that is not WiFi capable, most routers presently sold for home use support multiple wired physical connections and WiFi connections.
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Modems, Routers, Switches, and Hubs Explained Home Computers Laptops Networking Modems Routers Netcomm Picture To Share
http://scarsongs.net/2013/09/10/modems-routers-switches-and-hubs-explained/
Create and share high-speed internet access between multiple computers on your network, using the NetGear DGN1000-100NAS ADSL2+ wireless router. Get your network up and running in minutes with the graphical installation guide of this NetGear 4-port router. This wireless router is compliant with the IEEE 802.11 b/g standard, and operates on super-fast 2.4 GHz frequency. Data transmission is now safe and secure with Wi-Fi-protected access (WPA/WPA2-PSK) and WEP support of this NetGear 4-port router. Featuring the intrusion detection and prevention feature (IDS), the NetGear DGN1000-100NAS router detects and warns you about harmful network activity.
The purpose of a hub and a switch is similar -- to split a network connection into multiple network connections. The first types of routers on the market were basically four-port routers. You could plug in four Ethernet cables into them, which would allow you to have four computers plugged in. Sometimes there would be bigger routers (especially for bigger businesses) but we won't worry about that. We'll just pretend that we're in a situation where we have a basic modem that connects to a basic router, which outputs to four computers
http://stufftopin.com/z/015abdb28cd02a73ba303d3fe5a7f2ee/home-computers-laptops-networking-modems-routers-netcomm.htm
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