by Priya Nakamura Updated Apr 12, 2026
A router creates a local network and directs traffic between your devices and the internet. A modem connects your home to your ISP. Most people need both, though combo devices (gateways) include both in one box.
A modem translates the signal from your ISP (cable, fiber, DSL) into a digital signal your devices can use. A router takes that connection and shares it among multiple devices via WiFi and Ethernet. Think of the modem as the front door and the router as the hallway connecting all rooms.
If you have a combo device (modem/router gateway) from your ISP, you don't need a separate router. But many people add their own router for better WiFi performance and features, using the ISP device in bridge mode.
For more information, see Wikipedia — TCP/IP.
Pro Tip: DNS is often called the phonebook of the internet. Switching to a faster DNS can improve your perceived internet speed significantly.
Key Takeaways
A modem connects to your ISP and translates their signal. A router creates your home network and shares the internet connection among devices via WiFi and Ethernet.
You need a router to share the internet among multiple devices and create WiFi. Some ISP-provided devices combine both (modem/router gateway).
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About Priya Nakamura
Priya Nakamura is a telecommunications engineer and networking educator with a Master degree in Computer Networks and a background in ISP infrastructure design and management. Her experience spans both the technical architecture of broadband networks and the practical challenges home users face when configuring routers, managing wireless coverage, and understanding connectivity standards. At RouterHax, she covers WiFi standards and protocols, networking concepts, IP addressing, and network configuration guides.
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