VPNs are everywhere — ads for them pop up on every YouTube video and podcast. But most people using them don't actually understand what they do, what they don't do, and when they actually matter for security. This guide cuts through the marketing and explains it clearly.
Bottom line up front: A VPN (Virtual Private Network) encrypts your internet traffic and routes it through a server in another location. It hides your activity from your ISP and masks your IP address — but it is not anonymous and it does not make you unhackable.
Normally when you visit a website, your request travels from your device → your ISP → the website. Your ISP can see every site you visit, and the website can see your real IP address.
With a VPN, your traffic goes: your device → encrypted tunnel → VPN server → website. Your ISP only sees that you're connected to a VPN server. The website sees the VPN server's IP address, not yours.
The encryption part is key — even if someone intercepts your traffic, they can't read it. This is why VPNs are genuinely useful on public Wi-Fi.
⚠️ VPN myth: "A VPN makes me anonymous online." Not true. Your VPN provider can still see your traffic. If they keep logs and get a subpoena, your activity is exposed. True anonymity requires much more than a VPN.
What most consumers use. You connect to a VPN server run by a provider like NordVPN or Mullvad. Your traffic is encrypted and your IP is masked. Great for public Wi-Fi and bypassing geo-restrictions.
Used by businesses to connect multiple office locations securely over the internet. Instead of individual users connecting, entire networks are linked together. Common in enterprise environments you'll encounter in cybersecurity work.
Runs through a web browser using HTTPS. No software install needed. Common for corporate remote access where employees need to connect to internal resources from home.
These are VPN protocols — the technical standard the VPN uses. WireGuard is modern, fast, and becoming the new standard. OpenVPN is older but battle-tested. Most good VPN providers now offer both.
Free VPNs are risky. If the VPN is free, you're often the product. Many free VPN providers log and sell your browsing data — the exact opposite of what you want. Stick to reputable paid providers or Proton VPN's free tier.
| VPN | Price | Best For |
|---|---|---|
| Mullvad | ~$5/mo | Privacy focused, no accounts needed |
| Proton VPN | Free tier available | Beginners, free option is trustworthy |
| NordVPN | ~$3–5/mo | Everyday use, fast speeds |
| Tailscale | Free for personal | Connecting your own devices / home lab |
For beginners, Proton VPN's free tier is the safest starting point. It's run by the same team behind ProtonMail, has a strict no-logs policy, and the free version is genuinely usable — not crippled like most free VPNs.
As you get deeper into cybersecurity you'll encounter VPNs constantly:
Understanding how VPNs work also helps you understand how attackers abuse them. Many threat actors use commercial VPN services to mask their origin during attacks — something you'll see in threat intelligence reports as a SOC Analyst.
VPNs are a tested topic on CompTIA Security+. You'll need to know the difference between remote access VPNs and site-to-site VPNs, common protocols like IPSec, SSL/TLS, and WireGuard, and split tunneling concepts. Make sure you understand these before exam day.
A VPN is a useful tool but it's not a magic privacy shield. Use one on public Wi-Fi, use Proton VPN's free tier to get started, and understand its limitations before trusting it for anything sensitive. As you get into cybersecurity deeper, you'll use VPNs regularly — especially for lab environments like HackTheBox.
Your next step: Download Proton VPN for free and enable it next time you're on public Wi-Fi. Then check out the beginner roadmap to keep building your skills.