The Router is the central component in connecting all of your computers and network devices together, allowing them to access and share one high-speed Internet connection. It organizes all of the devices in the home network so that they can communicate with each other and share information. A Router combines the functions of a switch, which organizes and controls data flow among your computers and network devices. A switch is best for wired networks that want to share files and printers, but does not provide Internet access capability. A Router joins two networks, your home network and the Internet, passing information from one to the other. It also determines how the information is passed in the most efficient manner. The router's two main jobs are: To make sure that information doesn't travel where it's not needed. To make sure that information travels to its intended destination.
	The Router also provides security measures to your network which prevent outside users from accessing your private data. This is important because a high-speed Internet connection is always on, which makes it more vulnerable to attacks from hackers. You may already have a basic software firewall installed on your computer, but the network can still be easily broken into. ...more on d-link products.