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What is WiFi and how does it work?
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Most of us use WiFi every day for everything from streaming shows, scrolling on our phones or joining video calls. But what’s actually happening behind the scenes? Here’s a simple guide to what WiFi is, how it works and what can affect your signal and speed
By Virgin Media Edit
- Published
- 8 April 2026
Key Takeaways
WiFi connects your devices wirelessly using radio waves to link devices
It works through your router sending and receiving data between your devices and the internet
Multiple devices can connect at once as long as they’re within range of your router
WiFi signal strength can vary around your home
What is WiFi?
WiFi is a wireless technology that lets your devices connect to the internet without cables. Instead of plugging your laptop or phone directly into your broadband connection, WiFi uses radio waves to send data between your router and your devices.
That means multiple devices can all get online at the same time, as long as they’re within range of your router. It’s what makes staying connected around your home quick, convenient and cable-free.
It’s worth remembering that WiFi isn’t the same as the internet itself. Your broadband connection brings the internet into your home, while WiFi is the wireless way your devices connect to it.
How does WiFi get you connected?
WiFi works by sending data between your router and devices using radio signals.
When you do something online, like opening a website, sending a message or streaming a film, your device sends a request to your router. The router passes that request through your broadband connection to the wider internet, then sends the information back to your device wirelessly.
All of this happens almost instantly, which is why browsing, streaming and gaming feel seamless.
How connecting to WiFi works
When you join a WiFi network, a few quick steps happen in the background:
Your device finds available networks
Your phone, laptop or tablet scans for nearby WiFi networks being broadcast by routers.You choose your network and sign in
You select your network name (SSID) and enter the password to connect securely.Your router connects you to the internet
Once verified, the router assigns your device an IP address so it can communicate online.Data is sent wirelessly
Your device can now send and receive data through the router using WiFi radio signals.
Most modern routers broadcast WiFi on two main frequency bands: 2.4 GHz and 5 GHz. The 2.4 GHz band travels further and can pass through walls more easily, while the 5 GHz band usually delivers faster speeds over shorter distances.
What affects WiFi signal and speed?
Several factors can influence how strong and reliable your WiFi feels at home.
Distance from your router
The further you are from your router, the weaker the signal becomes. Thick walls, floors, ceilings and large furniture can also reduce signal strength. Placing your router in a central, open spot can help improve coverage around your home.
Interference from other devices
Electronics like microwaves, cordless phones, baby monitors and even nearby WiFi networks can interfere with your signal. This can sometimes cause slower speeds or buffering. Keeping your router away from other electronics can help improve performance.
Number of connected devices
If lots of devices are using your WiFi at the same time, the connection is shared between them. Streaming, gaming, video calls and smart home devices can all use bandwidth, which may slow things down during busy periods.
The broadband speed you choose
Your WiFi can only be as fast as the broadband connection coming into your home. If your broadband speed is limited, even a strong WiFi signal won’t make it faster.
Time for an upgrade?
Broadband not fast enough? Upgrading to faster broadband can help keep everything running smoothly, especially with multiple devices online.
Check out all of our ultrafast broadband deals and pop in your postcode to see what's available where you are.
WiFi vs broadband: what’s the difference?
WiFi and broadband work together, but they’re not the same thing.
Broadband is the internet connection that comes into your home from your provider
WiFi is the wireless connection that lets your devices access that broadband
For the best experience, you need both a fast broadband connection and strong WiFi coverage throughout your home.
Is WiFi secure?
Modern WiFi networks use security standards like WPA2 or WPA3, which encrypt your data and help keep your connection protected.
You can help keep your network secure by:
Using a strong, unique WiFi password
Avoiding sharing your network details publicly
Keeping your router software up to date
These simple steps help protect your personal information and prevent unwanted access.
Ready for faster WiFi?
If your WiFi isn’t performing as well as you’d like, small changes can make a big difference, like moving your router to a central spot or reducing interference from other devices.
But, if your broadband speed is holding things back, upgrading your package could give your whole home a boost. With a range of superfast fibre broadband options available, it’s easy to find a speed that suits your household.
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