The direct answer

A VPN works by creating an encrypted connection between your device and a VPN server. When you browse, your traffic goes through that encrypted link, so the destination websites generally see the IP address of the VPN server rather than your device’s usual IP.

Because this is a general VPN mechanism, the exact steps can vary by app, device, and configuration. Treat any “how it works” description as an overview, not a guarantee of specific outcomes.

A simple model of what happens

  1. Connection setup: Your VPN app connects to a VPN server you selected (or that it chose based on its settings).
  2. Encryption and routing: The app establishes an encrypted tunnel, then forwards your internet requests through it.
  3. Website visibility: Websites and online services typically receive requests from the VPN server’s network rather than your home/phone network.
  4. Traffic continues as normal: To you, browsing, streaming, and other internet use continues through your usual applications, but the path is altered by the VPN tunnel.

This model explains the core effect: traffic is protected in transit between your device and the VPN endpoint, and your apparent network location usually changes.

What it does well—and the key limits

  • Security in transit: Encryption protects data while it moves between your device and the VPN endpoint.
  • Privacy is not absolute: A VPN reduces what destination sites can infer from your IP, but it does not make you unidentifiable in all situations. The VPN provider, your browser behavior, and account logins can still matter.
  • No “zero” risk: Using a VPN can’t eliminate all threats (for example, malicious websites, unsafe downloads, or compromised accounts).
  • Performance can vary: Because traffic is routed through another server and encrypted, speed and reliability can change depending on network conditions and server distance/load.

These limits are normal for VPNs in general; they can change with correct configuration and with the trustworthiness of the service and client.

Practical checks you can do

  • Confirm the VPN is active: Look for the app’s connection status indicator and verify that the tunnel is enabled.
  • Check your apparent IP: Compare your public-facing IP before and after connecting to see whether it changes.
  • Test for leaks cautiously: If your app offers “leak protection” features, enable them and verify behavior with reputable diagnostics (without sharing sensitive data).
  • Validate key settings: Ensure the VPN is allowed through your device firewall/network permissions if the app requires it, and check that “always-on” or auto-connect options behave as expected.

If something doesn’t change after connecting (for example, your public IP or connection status), that’s a sign to review configuration or connectivity—not evidence that the VPN is working differently than expected.