What is a VPN?

An encrypted tunnel between your device and the rest of the internet. Instead of traveling in the open, your traffic goes through an intermediary server that makes it unreadable along the way. The sites you visit see that server’s address, not yours; your internet provider sees a tunnel, not what moves inside it.

That is what a VPN really does: hide your IP address from sites, hide your browsing from your internet provider, secure a dubious public Wi-Fi. Useful, sometimes precious when traveling.

The misconception to correct first? No, a VPN does not make you anonymous. It changes your license plate, not the driver. Signed in to your Google account, you remain identified, and the profiling goes on exactly as before, tunnel or not. Another point often forgotten: the traffic your internet provider no longer sees, the VPN service now sees. You move the trust, you do not remove it.

Where it plays out: the VPN category compares services that deserve that trust, the diagnostic tells you whether it is really your priority, and the book gives the VPN its rightful place in a complete approach.