What Is a VPN and How Does It Work?
A complete beginner's guide to VPNs -- what they are, how the encrypted tunnel works, and why millions of people use one every day.
What Is a VPN?
A VPN, or Virtual Private Network, is a service that creates an encrypted connection between your device and a server operated by the VPN provider. All of your internet traffic is routed through this server before it reaches websites, apps, or online services. From the outside, it looks like your traffic originates from the VPN server -- not your home, office, or mobile network.
How the Encrypted Tunnel Works
When you connect to a VPN, your device and the VPN server perform a handshake -- exchanging cryptographic keys that only the two of them know. Every packet of data you send is encrypted on your device before it even leaves your network card. It travels across the internet as unreadable ciphertext until it arrives at the VPN server, which decrypts it and forwards your request to the destination. The response makes the same journey in reverse. This end-to-end process is called the VPN tunnel.
Modern VPNs like Nexun use the WireGuard protocol, which is faster and more efficient than older protocols like OpenVPN or IKEv2. WireGuard uses state-of-the-art cryptography -- including ChaCha20 for encryption and Curve25519 for key exchange -- in a codebase small enough to be audited by a single engineer. That simplicity is a security feature: fewer lines of code means fewer places for vulnerabilities to hide.
What a VPN Protects You From
Without a VPN, your Internet Service Provider (ISP) can see every domain you visit. Public Wi-Fi operators -- at airports, cafes, and hotels -- can potentially intercept unencrypted traffic. Advertisers use your IP address to build a profile of where you browse from. A VPN addresses all of these by encrypting your traffic and masking your real IP address.
- ISP surveillance and traffic logging
- Public Wi-Fi interception attacks
- IP-based location tracking by websites and advertisers
- Geo-restrictions on content and services
- Deep packet inspection by networks or governments
Who Needs a VPN?
The honest answer is: almost everyone who values their privacy online. Journalists protecting sources, remote workers securing company data, travelers wanting access to home content, and ordinary people who simply do not want their ISP selling browsing data to advertisers -- all benefit from a VPN. In the EU, ISPs are bound by GDPR, but data retention rules still allow authorities to request logs. A VPN reduces what can be logged in the first place.
What a VPN Does Not Do
A VPN is not a magic shield. It does not protect you from malware, phishing sites, or browser fingerprinting. It does not make you completely anonymous -- the VPN provider can theoretically see your traffic unless they have a strict no-logs policy. This is why choosing a trustworthy provider matters. Nexun's Privacy Logging feature takes a unique approach: connection logs are stored locally on your device, never on Nexun's servers, so there is nothing to hand over even under a legal request.
Getting Started
Setting up Nexun takes under two minutes. Download the app for Android or Windows, create an account, and tap Connect. The WireGuard tunnel establishes in milliseconds. If you use Chrome, the Nexun browser extension lets you route just your browser traffic through the VPN without affecting other apps -- useful if you want to access geo-restricted content while keeping local network access for printers or smart home devices.
FAQ
Is using a VPN legal?
Yes, using a VPN is legal in all EU member states and most countries worldwide. A VPN is simply a privacy tool, like using encrypted email. The legality of what you do online remains unchanged -- a VPN does not make illegal activity legal.
Does a VPN slow down my internet?
A small overhead is unavoidable because data must be encrypted and routed through an extra server. However, with WireGuard, this overhead is minimal -- typically 5-10% on fast connections. Many users notice no difference in everyday browsing, streaming, or video calls.
What makes Nexun different from other VPN providers?
Nexun's Privacy Logging feature stores connection logs on your device only -- never on Nexun's servers. This means there is nothing to subpoena, hack, or accidentally expose. Combined with the WireGuard protocol and a clean Dutch jurisdiction under GDPR, Nexun is built for people who take privacy seriously.