With remote work and public Wi-Fi everywhere, protecting your connection has become a priority. If you have ever wondered what is a VPN and whether you need one, you are not alone. It is one of the best-known tools for securing traffic. However, it is also surrounded by myths, especially regarding privacy.
In this article, we explain how a VPN works, which types and protocols exist and when it truly makes a difference.
What is a VPN
VPN stands for Virtual Private Network. It creates an encrypted tunnel between your device and a trusted server. All traffic flows through that tunnel before reaching the internet or the company's internal network.
As a result, anyone on the same Wi-Fi network, or even your internet provider, sees only scrambled data.
How a VPN works in practice
- The VPN client on your device authenticates with the server using a password, certificate or key.
- Next, both sides negotiate encryption keys.
- Each data packet is encrypted and wrapped inside another packet.
- The VPN server receives, decrypts and forwards the packet to its final destination.
- The response travels back through the same tunnel.
Consequently, the website you visit sees the VPN server's IP address instead of yours.
Types of VPN
Remote access VPN
Connects an individual employee to the company network. It is the most common model for remote work and allows secure access to internal systems, file servers and ERPs.
Site-to-site VPN
Links two entire networks, such as headquarters and a branch office. The routers or firewalls at each end keep the tunnel permanently active, with no user involvement.
Consumer VPN services
Paid services that offer servers in many countries. People use them to protect browsing on public networks and, in some cases, to access geo-restricted content.
The main VPN protocols
- WireGuard: modern, lightweight and very fast. Its small codebase makes security audits easier.
- OpenVPN: mature, flexible and open source. It works well even on restrictive networks.
- IPsec/IKEv2: the standard on enterprise equipment and very stable on mobile devices.
- PPTP: obsolete and insecure. It should no longer be used.
When your business needs a VPN
- Employees access internal systems from outside the office.
- Branch offices need to share servers and databases.
- Vendors need occasional, controlled access to an environment.
- The team often works on public networks in airports, hotels and cafés.
What a VPN does not do
A VPN protects the path your data travels, but it does not protect against everything. It does not stop phishing, remove malware or make you anonymous on sites where you log in. Furthermore, the VPN provider can see your traffic. Therefore, choose a trustworthy vendor.
Many companies are also complementing VPNs with the Zero Trust model (ZTNA), which grants access application by application instead of opening the entire network.
Best practices
- Enable multi-factor authentication for VPN access.
- Keep servers and clients up to date.
- Allow only the networks and ports each profile needs.
- Log and monitor connections.
Frequently asked questions
Is using a VPN legal?
In most countries, yes. What remains illegal are unlawful activities, with or without a VPN.
Does a VPN slow down the internet?
Slightly, because of encryption and the distance to the server. With WireGuard and a nearby server, the difference is usually small.
Conclusion
Now you know what a VPN is and why it remains an important piece of network security. It protects data in transit, connects branch offices and enables remote work. Combine your VPN with MFA and a least-privilege access policy for the best results. If your company needs to set up secure remote access, WDS Developer can help.