How Does a VPN Work? Tunnels, Protocols and Keys Without the Math

You click Connect, half a second passes, a shield turns green. Here's what happened in that half-second — no math required.

Step 1: The handshake

Your VPN app contacts the server you picked and they negotiate a session: the app proves your account is valid, both sides agree on an encryption method, and they exchange keys — using cryptography that lets two strangers agree on a secret even while someone watches every message. From here on, everything between you and the server is locked with keys that exist nowhere else.

Step 2: The tunnel

Your device creates a virtual network interface — a fake network card. The operating system routes ALL traffic into it, where each data packet gets encrypted and wrapped inside a new packet addressed to the VPN server. Your ISP delivers these wrapped packets without any ability to see what's inside — that wrapping is the 'tunnel'.

Step 3: The exit

The server unwraps your packets and sends them to their real destinations — with the server's own IP as the sender. Replies come back to the server, get encrypted, and travel back down the tunnel. To every website, you ARE that server. That's the whole trick behind getting an IP in another country.

The supporting cast

DNS: your 'which IP is google.com' lookups also go through the tunnel to the provider's own resolvers — otherwise your ISP would still see every site name (a 'DNS leak'). The kill switch: blocks traffic entirely if the tunnel drops. Protocols: WireGuard vs OpenVPN is essentially a choice between modern speed and maximum compatibility.

Where trust actually sits

Notice what moved: your ISP can no longer see your traffic — but the VPN server could. That's why the provider's audited no-logs policy is the entire game, and why we track audit status on every profile, including the free plans.