What Is a VPN?
A Virtual Private Network (VPN) is a technology that creates a secure, encrypted tunnel between your device and the internet. When you connect through a VPN, your data is routed via a private server — masking your IP address and shielding your online activity from third parties such as internet service providers, advertisers, and malicious actors.
How Does It Work?
The process is straightforward:
• Your device connects to a VPN server using an encrypted protocol (e.g., OpenVPN, WireGuard, or IKEv2).
• All outbound traffic appears to originate from the VPN server's IP address — not your own.
• Data in transit is encrypted end-to-end, making it unreadable to anyone intercepting the connection.
• Websites and services see only the VPN server's location, not your actual one.
Key Uses of a VPN
• Privacy Protection: Prevents ISPs, advertisers, and governments from monitoring your browsing habits.
• Secure Public Wi-Fi: Encrypts your connection on open networks (cafés, airports, hotels) where eavesdropping is common.
• Remote Work Access: Allows employees to securely connect to corporate networks and internal resources from anywhere.
• Bypassing Geo-Restrictions: Enables access to content or services restricted to specific regions (streaming libraries, news sites).
• Avoiding Censorship: Useful in regions where certain websites or platforms are blocked by government firewalls.
Limitations to Keep in Mind
A VPN is a powerful privacy tool, but not a complete security solution:
• It does not protect against malware, phishing, or device-level threats.
• A VPN can slow connection speeds due to encryption overhead and server routing.
• Free VPN services may log and sell your data — defeating the purpose entirely.
• VPN use is restricted or illegal in some countries; always check local regulations.
Choosing the Right VPN
When evaluating a VPN provider, prioritise the following:
• No-log policy: The provider should not store records of your activity.
• Strong encryption standards: Look for AES-256 encryption and modern protocols like WireGuard.
• Kill switch feature: Automatically cuts your internet if the VPN drops, preventing accidental exposure.
• Jurisdiction: Providers based in privacy-friendly countries offer stronger legal protections.
• Independent audits: Third-party security audits signal transparency and trustworthiness.
Cybersecurity
Browsing Smarter: What a VPN Does and Why It Matters
Saikat Biswas, Director
06 May 2026
Cybersecurity
A plain-English guide to Virtual Private Networks — what they are, how they work, and when to use one.