What is a VPN?

Updated 21 September 2026 · How we research

A VPN — virtual private network — creates an encrypted tunnel between your device and a server you choose, then sends your internet traffic through it. That single change has three consequences worth understanding separately.

What a VPN actually changes

Your traffic becomes unreadable in transit

The network carrying your packets — your ISP, a hotel, a coffee shop — sees encrypted data rather than destinations and contents.

Your apparent location changes

Sites see the VPN server's address instead of yours, which affects geolocation and region-based access.

Trust moves, it does not disappear

You stop trusting the local network and start trusting the VPN provider. That is a clear improvement on hostile Wi-Fi and closer to a lateral move at home.

How a ZoogVPN connection works

Encryption protects the path to the VPN server; the server then forwards traffic to its destination.

Your device
Original IP and traffic
ENCRYPTED
ZoogVPN server
Tunnel endpoint and IP exit
FORWARDED
Internet
Sites see the server IP

Important

A VPN protects network traffic in transit; it does not replace device security, strong passwords or account protection.

The basic shape of every VPN connection, regardless of provider.

What a VPN does not do

Most disappointment with VPNs comes from expecting the wrong things. A VPN does not make you anonymous, does not block malware, does not stop tracking inside a browser session, and does not protect an account you log into. It changes the network path, and little else.

Calibrating expectations is the most useful first step.

Common belief	Reality
"A VPN makes me anonymous"	It changes your apparent address. Logins, cookies and browser fingerprinting still identify you.
"A VPN stops viruses"	No. It encrypts traffic; it does not inspect downloads.
"A VPN hides everything from my ISP"	Your ISP can still see that you are connected to a VPN, and the volume and timing of traffic.
"All VPNs are the same"	Protocol support, leak handling and logging policy differ substantially — see protocols.

When it genuinely helps

Untrusted networks such as hotels, airports and cafes — see public Wi-Fi.
Preventing your ISP from building a profile of the sites you visit.
Reaching services from your home country while travelling.
Reducing exposure of your home IP address in peer-to-peer applications.

Going deeper

If you want the mechanics rather than the summary, start with how a VPN works, then protocols and encryption. The full map is on the technology hub.

Frequently asked questions

Does a VPN make me anonymous?

No. It changes your apparent network location, and that is the whole of it. Any account you sign in to still knows who you are, cookies survive the change, and browser fingerprinting recognises the same browser on a new address. A VPN is useful against the network you are sitting on and against address-based tracking - anonymity is a much larger problem.

Is a free VPN safe?

It depends entirely on how the provider funds itself. Running a server network costs real money, so if you are not paying, something else is covering it - advertising, data, or a paid tier the free one exists to sell. A free tier from a provider with a clear paid business is a different proposition from a free-only service with no stated model.

Will a VPN slow my connection?

Usually a little. Traffic travels further and is encrypted at both ends, and the tunnel adds per-packet overhead. In practice server distance dominates everything else: a nearby server typically costs a small percentage of throughput, while a distant one adds latency no protocol can remove. Encryption is rarely the limiting factor on modern hardware.

Do I need a VPN at home?

Less than on a public network, and for different reasons. At home the local network is usually yours, so the case rests on what your ISP can see and retain rather than on anyone nearby. In some countries that is a serious concern and in others it is minor - the honest answer depends on where you are, not on the technology.

Does a VPN stop websites tracking me?

Only the part that depends on your address. Cookies, logins and browser fingerprinting all survive the change, so a site you use regularly still recognises you. Changing your address helps against network-level observation and address-based profiling; browser-level tracking needs browser-level tools.