What is the difference in functionality between a router and modem?
A modem is used to connect a single computer or device to the internet and is usually supplied by the broadband service provider. When connected to a router, the modem provides a gateway connection to the internet for multiple devices. A wireless router allows multiple devices to share one connection to the internet without those devices being physically connected. Routers are normally physically connected to the modem, however many broadband providers are now using combination modem/routers.
