What a VPN Is and How to Choose One — The Encrypted Tunnel and the Criteria That Matter

Conclusion: A VPN creates an encrypted tunnel between your device and a VPN server, protecting your traffic while making your connection appear to come from another location. It is effective for securing public Wi-Fi and protecting privacy, but it is not antivirus software and it does not make you anonymous. Choose one on these criteria: no-logs policy and jurisdiction, speed, number of server countries, simultaneous connections, price and money-back guarantee, and the kill switch and protocols (WireGuard/OpenVPN). VPN legality varies by country, and a VPN is not a tool for illegal activity.

What you will learn

• What a VPN is and how the encrypted tunnel works
• What a VPN protects and what it does not (not anonymity, not antivirus)
• The legitimate reasons to use a VPN
• How to choose a VPN — the practical criteria
• Why legality differs from country to country

What a VPN is

This article contains affiliate links. Placement and the presence of links never affect our editorial neutrality. Always confirm current prices, specifications, and availability on each provider’s official site.

A VPN (Virtual Private Network) is a technology that creates an encrypted private path between your device and a provider’s VPN server. The UK’s security agency, the NCSC, describes a VPN as an “encrypted network connection” that lets you connect securely across untrusted networks. OpenVPN’s official site likewise defines a VPN as a “securely encrypted internet connection (or ‘tunnel’) to connect devices … over otherwise unsecured networks.”

Two points matter. First, because your traffic is encrypted, a third party on the same public Wi-Fi — or an intermediary along the route — cannot easily read its contents. Second, because your traffic exits to the internet through the VPN server, the “connecting country and IP address” seen by the sites you visit is that of the VPN server, not your own.

How the encrypted tunnel works

A VPN takes the IP packets your device sends, encrypts and wraps them, and carries them in a form that only the two ends of the tunnel can open. The component that handles this “wrap, carry, unwrap” is the VPN protocol. WireGuard’s official site states that the protocol uses modern cryptography — ChaCha20 for encryption, Poly1305 for authentication, and Curve25519 for key exchange — built on the Noise protocol framework.

WireGuard rotates its keys every few minutes for “perfect forward secrecy,” so that even if one key were exposed, past traffic is not easily decrypted retroactively. OpenVPN is an SSL/TLS-based protocol with a long track record, strong on compatibility and configuration flexibility. Whichever you use, the principle is the same: only the entrance and exit of the tunnel can handle the contents.

What a VPN protects and what it does not (important)

What a VPN does well is protecting the path your traffic travels. Preventing eavesdropping on public Wi-Fi, encrypting your traffic, and masking your originating IP are its core roles. The NCSC frames the primary purpose of a VPN as protecting data in transit.

What a VPN cannot do is just as clear. First, a VPN is not antivirus software. It does not stop you from downloading a malicious file or visiting a phishing site; malware protection is a separate layer. Second, a VPN does not make you anonymous. Your logged-in accounts, browser cookies and fingerprint, and the VPN provider itself can still identify you. That is exactly why what a provider does not record — its no-logs policy — is central to the choice.

Legitimate reasons to use a VPN

A VPN has several broadly accepted, legitimate uses. The first is securing your traffic on public Wi-Fi in cafés, airports, and hotels. The second is connecting securely to corporate systems while working remotely — the mainstream, business origin of VPNs. The third is privacy: keeping your network provider or an intermediary from collecting your browsing history. The fourth is practical, such as accessing your own home-country online services as usual while traveling.

Each of these aligns with the core value of a VPN: increasing the security and privacy of your connection. This article assumes these legitimate uses as it lays out how to choose.

How to choose a VPN — the criteria

When choosing a VPN, comparing on these six criteria keeps the decision clear.

1. No-logs policy and jurisdiction. Does the provider avoid storing browsing or connection logs, and has it been independently audited? The provider’s home jurisdiction also matters. Proton VPN, for example, states that being based in Switzerland means it has no forced logging obligation, and that when it was ordered to hand over logs, no such records existed.
2. Connection speed. For streaming and large transfers, speed shapes the experience. Support for a fast protocol such as WireGuard is a good signal.
3. Number of server countries. More destinations mean more options for avoiding congestion and covering different use cases.
4. Simultaneous connections. How many devices — phone, laptop, tablet, and family devices — a single plan covers at once.
5. Price and money-back guarantee. Long-term plans tend to be cheaper, but the safe move is to test in your own setup within the refund window first.
6. Kill switch and protocols. A kill switch that cuts traffic the instant the VPN drops, and support for proven protocols such as WireGuard and OpenVPN.

How the major VPNs are positioned (comparison)

Here is how the major providers are positioned (partnerships are being finalized, so always confirm current pricing and availability officially).

If breadth of countries and speed matter most, a large provider like NordVPN is a sensible starting point; for many devices at once, Surfshark is a natural comparison. If privacy and jurisdiction come first, Proton VPN is also worth considering. Either way, test it in your own setup within the refund window.

The legality note (important)

Using a VPN itself is legal in most countries and is broadly accepted for uses such as securing public Wi-Fi and remote work. That said, some countries restrict or regulate VPN use outright, and treatment varies widely from country to country.

A VPN is not a tool for illegal activity. Uses that violate a service’s terms (such as watching a streaming library outside your country of residence) or that break the laws of the country you are in or reside in are outside what this article recommends. Before you rely on a VPN, check both (1) each service’s terms of use and (2) the laws of the country you are in or reside in, and decide at your own responsibility.

FAQ

Does a VPN make me completely anonymous?

No. A VPN hides your originating IP and encrypts your traffic, but your logged-in accounts, cookies and browser fingerprint, and the VPN provider itself can still identify you. It is more accurate to think of it as protecting your connection and improving privacy, not as making you anonymous.

If I have a VPN, do I still need antivirus?

Yes. A VPN encrypts your traffic; it does not stop malware or phishing. Antivirus software and careful downloading are a separate, complementary layer. The two do different jobs.

Should I choose WireGuard or OpenVPN?

In general, WireGuard is fast and lightweight and uses modern cryptography, which makes it a common default for everyday use. OpenVPN is SSL/TLS-based with a long track record and is strong on compatibility and configuration flexibility. Most VPNs support both, so the practical move is to test speed on the default protocol first.

References

• WireGuard: fast, modern, secure VPN tunnel (WireGuard official)
• Virtual Private Networks (VPNs) (UK NCSC)
• OpenVPN — Secure VPN Solutions (OpenVPN official)
• Does Proton VPN keep logs? (Proton VPN official)

This article was compiled by the VPN editorial team by cross-checking each provider’s official specifications against primary sources from security agencies. Prices, specifications, and availability are current as of writing; confirm the latest details on each provider’s official site.