How does a VPN actually hide your internet traffic?

[Tel86]

A VPN works by creating what is called an encrypted tunnel between your specific device and a server run by the VPN provider. All of your actual internet traffic gets routed through that tunnel first, encrypted in a way that makes it unreadable to anyone intercepting it along the way, before it ever actually reaches its final real destination out on the wider open internet.

Without a VPN active, your internet service provider can see every single website you connect to, even if the actual specific content of an encrypted site itself stays hidden through standard HTTPS. With a VPN active, your provider can only see that you are connected to the VPN server itself, not which specific sites you are actually visiting through that established tunnel.

From the perspective of any website you actually visit while connected. Your traffic appears to be coming directly from the VPN server's own IP address rather than your real one, which is exactly why a VPN can make it look like you are browsing from a genuinely different country entirely, since the site only ever sees the VPN server's specific location, not your own actual real physical location.

It is genuinely important to understand this specific tradeoff clearly though. A VPN does not make you fully anonymous online in some absolute sense, it just shifts exactly who is able to see your actual traffic, your own ISP loses visibility, but the VPN provider itself can technically see everything instead, which is precisely why actually trusting your specific chosen VPN provider matters so much in practice.

So the core actual mechanism is encryption plus rerouting. Your data gets encrypted so your own ISP cannot read it, and it gets rerouted through a different server so the sites you visit see a different IP address than your genuine real one

[VoidWalker79]

TLDR, a VPN encrypts your traffic so your own ISP cannot see which sites you visit. And reroutes it through a different server so those sites see the VPN's IP address rather than yours directly

[Paige_26]

The point about the VPN provider itself being able to see everything is the part more people need to actually understand before picking one.

You are not eliminating tracking entirely, you are just relocating exactly who is doing it

[Adam2]

Does a VPN actually slow your connection down noticeably. Or has that improved enough with modern protocols that it is basically unnoticeable for most typical regular everyday use these days?

[Falcon]

Clear writeup, appreciated!

Always understood VPNs at a fairly surface level before this, but clearly did not properly grasp the specific and important distinction between hiding traffic from your ISP versus true full anonymity online

[Beth3.0]

Figure this is exactly why businesses use VPNs so heavily for remote work too. Not primarily for anonymity at all, but specifically for that same secure encrypted tunnel connecting directly back into internal private company systems

[StarKnight36]

In brief, encryption hides your traffic from your ISP specifically.

Rerouting hides your real IP address from the actual sites you visit, but the VPN provider itself can still technically see everything happening. That part surprised me

[Rooney]

Also, that free VPN services really deserve real skepticism here. Running that server infrastructure costs real money somewhere, and if you are not the one actually directly paying for it, your own data is very possibly the actual product being sold or monetized instead

[Dave_37]

The HTTPS point is a quite nice added clarification. Always assumed a VPN was doing something totally separate from that, helpful to actually understand how the two different layers of protection actually relate to and complement each other

[Kane44]

This finally properly explains why my streaming service sometimes shows me a completely different country's available content library whenever I happen to have a VPN switched on for something unrelated.

Solid point

[Nicola]

Makes sense why some countries actively try to block VPN traffic entirely then.

If it particularly hides exactly which sites someone is visiting from their own ISP, that would obviously undermine any broader national network level monitoring effort pretty significantly