When you sign a contract with an internet provider, they'll typically send you a modem and a router in the mail. But which is which? And how are they different? A modem and a router work in tandem ...

Are you confused about the difference between a router and a modem? You’re not alone. Many people use these terms interchangeably, but they are actually two distinct devices with different functions.

Jim Rossman / TNS This week, a reader writes, "I’ve had AT&T internet service for quite some time and still have the original router and modem. Should I upgrade for security and performance reasons?