You’ll need a suitable modem and router to utilize Xfinity internet. A modem and a router may appear to be the same thing, but they are not. A modem is a device that links your home to your service provider, which in this case is Xfinity. A router connects to your modem to create a Wi-Fi network in your house via which your computers and other connected devices can access the internet. You can buy modems and routers separately or use a device that combines the two.