router vs modem
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Solved by JohnnyGrey,
A router makes your internet Wireless (wifi)
Just to clarify, not every router has wireless. To keep it simpler, a router assigns IP addresses and directs traffic to more than one device.
You can use the modem directly with a PC, but in order to have multiple devices connect, you'd need a router right after the modem.
Figured I'd edit this: Some ISP's give you a "Gateway," which is the modem, router, ethernet switch, and wifi access point all in one box. Our AT&T service has this, and the home phone also comes out of it too.
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