A VPN, or Virtual Private Network, is a service that creates an encrypted tunnel between your device and a remote server, hiding your real IP address and scrambling your internet traffic so that outsiders cannot read it or easily see which sites you visit. When you turn on a VPN, your data travels inside this protected tunnel to the VPN server, which then forwards it to the website you want, making it appear to come from the server rather than from you. VPNs are widely used for privacy on public Wi-Fi, for securing remote work connections and for reducing the amount of data your internet provider can see. In India, VPNs are legal, but providers that operate servers here face specific data-logging rules under CERT-In directions.
Answer first: what a VPN does and does not do
A VPN does two main things: it encrypts your traffic so eavesdroppers on the same network cannot read it, and it masks your IP address so websites and networks see the VPN server’s address instead of yours. What a VPN does not do is make you completely anonymous. Your VPN provider can still see your activity unless it keeps no logs, websites can identify you through logins and cookies, and a VPN does not remove malware or stop you from being phished. Treat it as one privacy tool among several, not a cloak of invisibility.
How a VPN tunnel works
The technology behind a VPN is called tunnelling. Your device runs a VPN client that establishes a secure connection to a VPN server using a tunnelling protocol. Your internet traffic is broken into small units called packets, which are wrapped inside other packets in a process known as encapsulation, and then encrypted. This wrapped, scrambled data travels across the public internet to the VPN server, which decrypts it and sends it on to its destination. Replies come back the same way. Because the contents are encrypted end to end between your device and the server, anyone intercepting the packets in between, such as on a cafe hotspot, sees only unreadable data.
Encryption is the heart of the process. If you want to understand the underlying idea of keeping messages readable only to the intended parties, our explainer on end-to-end encryption covers the same principle applied to messaging.
What a VPN hides, and from whom
| Party | Without a VPN | With a VPN |
|---|---|---|
| Public Wi-Fi snoopers | Can see unencrypted traffic | See only encrypted data |
| Internet provider | Sees sites you connect to | Sees only that you use a VPN |
| Websites you visit | See your real IP address | See the VPN server’s IP |
| The VPN provider | Not involved | Can see your traffic unless it keeps no logs |
Your public-facing address is central to this. To understand what that address reveals, read our explainer on the IP address.
Common uses for a VPN
- Public Wi-Fi safety. Encrypting traffic on airport, cafe and hotel networks stops local snooping.
- Remote work. Companies use VPNs so employees can reach internal systems securely from anywhere.
- Privacy from the provider. A VPN limits how much browsing detail your internet provider can log.
- Reaching your home network or region-locked services you are entitled to use.
A VPN pairs well with website encryption. Our explainer on the difference between HTTP and HTTPS shows why the padlock still matters even when a VPN is on, because the VPN protects the path while HTTPS protects the conversation with the website itself.
VPN rules in India: the CERT-In directions
VPNs are legal to use in India, but the regulatory picture for providers changed in 2022. Under directions issued on 28 April 2022 by the Indian Computer Emergency Response Team (CERT-In), acting under Section 70B(6) of the Information Technology Act, 2000, VPN service providers, data centres, cloud providers and others must collect and retain detailed subscriber information for at least five years, even after a customer stops using the service. The logged details can include validated names, addresses, contact numbers, email addresses, the period of hire, the IP addresses allotted, and the purpose of use. Separately, covered entities must report specified cyber incidents to CERT-In within six hours of noticing them.
The practical effect is that a strict no-logs promise is hard to honour on servers physically located in India. Some VPN companies responded by moving their India-based servers out of the country while continuing to offer virtual India locations. If privacy is your goal, read a provider’s logging policy carefully rather than trusting marketing claims, and remember that rules can evolve.
VPN protocols: the engines behind the tunnel
A VPN’s security and speed depend heavily on the protocol it uses to build the tunnel. You do not usually need to configure this by hand, but it helps to recognise the names. Older protocols are now considered weak and are best avoided. Widely trusted modern options are valued for combining strong encryption with good performance, and one newer, streamlined protocol has become popular for being fast and efficient on mobile devices. When choosing an app, prefer one that uses current, well-regarded protocols and strong encryption standards, and that is updated regularly. A VPN is only as secure as the cryptography and code behind it, so an abandoned or outdated app can give a false sense of safety.
VPN vs proxy vs Tor
People sometimes lump these together, but they solve different problems.
- Proxy. A proxy reroutes traffic for a single app and can mask your IP, but it usually does not encrypt everything, so it offers weaker privacy than a VPN.
- VPN. A VPN encrypts and routes all of your device’s traffic through one provider you choose and trust, balancing privacy, speed and ease of use.
- Tor. Tor bounces your traffic through several volunteer-run relays for strong anonymity, but it is much slower and is aimed at situations where anonymity matters more than speed.
For everyday protection on public networks, a reputable VPN is usually the practical middle ground, and for most people it strikes the right balance between meaningful privacy and a connection that stays fast enough to use comfortably every day.
VPNs at work versus at home
Not all VPNs are about personal privacy. Businesses have used VPNs for years so that employees working remotely can securely reach internal servers, files and applications as if they were in the office. In that setting the goal is controlled access to a private network, and the company runs the VPN server itself. Consumer VPN services, by contrast, are about privacy and reaching the wider internet through the provider’s servers. Both use the same core tunnelling idea, but the purpose and who controls the server differ, which is worth remembering when a workplace tells you to connect through its VPN: that tunnel is managed by your employer, not a privacy service.
Limits and risks of relying on a VPN
- Trust shifts to the provider. You are trusting the VPN company with the traffic your provider used to see, so its logging policy and jurisdiction matter.
- No protection against phishing or malware. A VPN will not stop you from clicking a fraudulent link; our guide to phishing explains those threats.
- Logins and cookies still identify you. Signing into accounts reveals who you are regardless of your IP.
- Free VPNs can be risky. Some monetise by logging or selling data, defeating the purpose.
Setting up and testing a VPN
Getting started is straightforward: install the provider’s official app from a trusted source, sign in, and connect to a server. A few checks make sure it is actually protecting you. After connecting, confirm your visible IP address has changed to the server’s, which many providers show in the app or on a status page. Enable the kill switch so that if the tunnel drops unexpectedly, your traffic is blocked rather than leaking out unprotected. Watch for DNS leaks, where your device quietly sends look-up requests outside the tunnel and exposes the sites you visit; reputable apps route these through the VPN and some offer a built-in leak test. On mobile, allow the VPN to reconnect automatically when you join new networks, since public Wi-Fi is exactly where you most need it. Finally, remember that connecting to a distant server can slow your connection, so choose a nearby server when speed matters and privacy needs are routine.
How to use a VPN sensibly
Choose a reputable provider with a clear, tested logging policy and strong, modern encryption. Keep the app updated, enable a kill switch that blocks traffic if the tunnel drops, and turn the VPN on before you connect to untrusted networks. Combine it with other basics such as strong unique passwords and multi-factor login. Above all, match the tool to your threat: a VPN is excellent for protecting traffic on shared networks and limiting provider visibility, but it is not a substitute for good security habits overall.
This article is educational and general in nature. Laws, provider policies and encryption standards change over time, so verify current rules with CERT-In and read your provider’s terms before relying on a VPN. For more technology explainers, visit newsreverse com or the technology section.