A modem and a router are both devices used in a computer network, but they have different functions. Here is the difference between a modem and a router:

Modem: A modem, derived from the term “modulator-demodulator”, is responsible for establishing the connection between your home network and the internet. It converts the signal from your internet provider into a format that can be understood by your local network. A modem uses various technologies, such as DSL, cable, fiber, or satellite, to establish the internet connection. The modem is usually the first point of contact with the internet provider and is often directly connected to the main connection in your home.

Router: A router is responsible for routing network traffic within your home network. It acts as a switchpoint between different devices in the network and determines how data is sent between these devices. A router can support wireless (Wi-Fi) and wired connections. It distributes internet traffic between the connected devices, allowing these devices to communicate with each other and access the internet. Moreover, a router often offers features such as network security, port forwarding, and settings for managing the network.

In summary, a modem is the device that establishes the connection to the internet, while a router is the device that manages network traffic within your home network. In many cases, modems and routers are combined into one device, known as a modem-router combo or gateway. This simplifies things for users as they only need to manage one device for both the internet connection and local network traffic.