What is a router?
Author: Domeny.ForSale editorial team Published
In brief: A router is a device that forwards data between networks, for example between your home network and the internet. It lets a computer, phone and TV share a single internet connection. A home router usually also provides Wi-Fi, but a router and Wi-Fi are not the same thing, and the device itself does not replace an internet access service.
How does a router work in a home network?
Data travels over a network in small units called packets. A router reads their destination addresses and decides where to forward them. An IP address is an identifier used to address a device or its connection to a network.
When you open a website on a laptop, the device sends packets to the router, which directs them towards your provider’s network. In a typical home network, the router also uses NAT, or network address translation. This allows multiple devices to share a public IPv4 address, while the router tracks connections so that responses reach the correct recipient.
A home router usually assigns local IP addresses to devices automatically using a service called DHCP. This means that after entering the Wi-Fi password, you generally do not need to configure network settings manually. Devices on the same network can also communicate locally: for example, a laptop can send documents to a printer even during an internet outage.
Router, modem and access point — how do they differ?
These functions are often combined in a single unit, which can make the equipment difficult to identify. The distinction, however, lies in what the device does, not its appearance or the number of antennas.
| Device | Main purpose |
|---|---|
| Router | Forwards data between networks, such as a home network and a provider’s network. |
| Modem | Handles transmission over a particular type of connection, such as cable or cellular. |
| ONT terminal | Terminates the provider’s fibre-optic connection and usually provides an Ethernet connection for the router. |
| Wi-Fi access point | Connects wireless devices to the local network. |
| Network switch | Connects wired devices within a single local network. |
A typical home “Wi-Fi router” combines a router, an access point and a small switch. Equipment supplied by a provider may also include a modem or a fibre-optic terminal. A device sold as an LTE or 5G router, meanwhile, usually has a built-in cellular modem and uses a SIM card.
Wi-Fi is not the internet. A phone can have a strong Wi-Fi connection to the router but fail to open websites if the provider’s connection has stopped working. A strong signal tells you about the connection to the access point, not the availability or speed of the internet.
What are WAN and LAN ports for?
The WAN port is usually used to connect the router to the provider’s equipment, such as a modem or an ONT terminal. LAN ports let you connect equipment in your home: a computer, TV, console or additional switch. Ethernet is the technology used for these wired network connections.
An example fibre-optic installation works like this: the fibre runs to the ONT terminal, an Ethernet cable connects the terminal to the router’s WAN port, and a computer is connected to a LAN port. A phone uses the same router over Wi-Fi. If the terminal and router are integrated, a separate cable between them is not needed.
Port labels and capabilities depend on the model; some ports can switch between WAN and LAN roles. Before connecting your own router, check your provider’s documentation for the required configuration method. Simply plugging in a cable is not always enough — you may need login credentials or specific network settings.
How do you choose a router for your connection and home?
First, establish whether you need just a router or a device with a modem. A router with an Ethernet input cannot directly accept a telephone cable, coaxial cable or optical fibre. Compatibility with your provider’s service matters more than the number of antennas.
When comparing models, check:
- WAN and LAN port speeds. A 100 Mb/s port will limit a wired connection, even if your plan provides higher bandwidth.
- Wi-Fi standard and bands. The 2.4 GHz band usually reaches through obstacles more effectively, while 5 GHz often allows faster transmission over shorter distances. The benefits also depend on your phone or computer.
- Coverage in your particular home. Thick walls and multiple floors may require an additional access point or a mesh system, meaning cooperating Wi-Fi access points.
- Manufacturer support. Check the availability of software updates, WPA3 support and the option to create a separate guest network.
Do not treat the speed advertised on the box as a promise of download speeds on a single laptop. It may represent the combined theoretical capabilities of different bands. With a 600 Mb/s connection, a router with a 100 Mb/s WAN port will be a clear bottleneck; a model with gigabit ports removes that particular limitation but does not guarantee 600 Mb/s over Wi-Fi.
Where should you place a router, and how should you secure it?
Place a Wi-Fi router as centrally as possible relative to the places where you use the network, outside an enclosed cabinet and away from large metal obstacles. A wired connection is usually more predictable, making it a good choice for a work computer, console or TV.
After setting it up, change the default administrator password, set a strong Wi-Fi password and enable WPA3, or WPA2 with AES if older equipment does not support the newer security standard. Install updates and disable remote management from the internet if you do not need it. The administration panel password and the Wi-Fi password serve different purposes — they do not have to be the same.
Before buying a new router because of slow internet, compare how the same computer performs over a cable and over Wi-Fi. If the problem occurs only wirelessly, start by adjusting the device’s placement and checking coverage rather than changing your internet plan.
See also: What is 2FA?
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