What Is a VPN and Do You Actually Need One?
A VPN encrypts your traffic and hides your IP — but it doesn't make you anonymous and it does slow you down slightly. Here's what it actually does, what it doesn't, and whether you need one.
What a VPN does — the plain version
When you connect to a website without a VPN, your request goes directly from your device to the website. The website sees your real IP address (which reveals your approximate location and ISP), and your ISP can see which domain you're connecting to.
With a VPN:
- Your device encrypts the traffic and sends it to a VPN server (typically in a city or country you choose).
- The VPN server decrypts it and forwards the request to the website.
- The website sees the VPN server's IP — not yours.
- Your ISP sees only that you're connected to a VPN server — not which sites you're visiting.
What a VPN does NOT do
- Does not make you anonymous: The VPN provider can see your traffic. Websites can still track you via cookies, browser fingerprinting, and logged-in accounts (Google sees your Google activity regardless of VPN).
- Does not protect from malware: A VPN is not an antivirus. If you download malware, the VPN doesn't stop it.
- Does not protect from phishing: A VPN doesn't warn you if you're on a fake website.
- Does not improve speed: VPNs always add overhead. They can sometimes improve routing to specific servers, but they never make your base connection faster.
- Does not fully hide from your VPN provider: The VPN company can see your real IP and traffic. Choose one with an independently audited no-log policy if this matters to you.
Do you actually need a VPN?
Here is a realistic breakdown by use case:
- Public WiFi (airports, hotels, cafes): Yes — genuinely useful. Public WiFi has no encryption, meaning anyone on the same network can potentially intercept unencrypted traffic. A VPN encrypts everything between your device and the VPN server.
- Streaming geo-blocked content: Yes, if that content is unavailable in your region. A VPN makes you appear to be in a different country, giving access to different Netflix libraries, BBC iPlayer from outside the UK, etc. See the best VPNs for streaming.
- Privacy from your ISP: Moderate value. Without a VPN, your ISP can log and sell your browsing history. With a VPN, they see only that you're connected to a VPN. Worth it if you care about ISP data collection.
- Gaming: Mostly no. VPNs add latency. Occasionally a VPN can improve routing to specific game servers, but usually the opposite is true. See VPNs for gaming for when it helps.
- General home use, nothing specific: Optional. If you use HTTPS websites (the padlock in the browser — almost everything today), your data is already encrypted in transit. A VPN adds ISP-level privacy but doesn't dramatically change your security posture at home.
VPN protocols: WireGuard vs OpenVPN
The protocol determines how fast the VPN is:
- WireGuard: Modern, efficient, retains 85–93% of your base speed. The best choice for most users. Used by NordVPN (NordLynx), ExpressVPN (Lightway), Mullvad, Surfshark.
- OpenVPN: Older, widely compatible, but retains only 40–50% of speed due to cryptographic overhead. Avoid for high-bandwidth use.
- IKEv2/IPSec: Fast and stable, good for mobile (reconnects quickly when switching networks). Middle ground between WireGuard and OpenVPN.
See the full VPN speed impact report for measured data by protocol and provider.
Choosing a VPN
Key criteria: jurisdiction (where the company is based and subject to law), no-log policy (independently audited, not just claimed), protocol support (WireGuard preferred), and price. See our fastest VPN and best VPN for streaming comparisons for specific picks.
Avoid free VPNs for privacy use — most monetize user data, which defeats the entire purpose.