What Is a Proxy Server? Concept and How It Differs From a VPN

See how a relay server works, step by step.

What a proxy server is

A proxy server is a relay that sits between your device and a destination server, passing requests along on your behalf. When you connect to a website, your request goes to the proxy first, the proxy forwards it to the destination, and then relays the response back to you — so the destination server sees the proxy's IP address connecting, not yours.

Forward proxies vs. reverse proxies

What most people mean by "a proxy" is a forward proxy, sitting on the client (user) side, typically used for IP masking or access control. A reverse proxy sits on the server side instead, distributing traffic across multiple servers or hiding the real server address — and it is quietly running behind most of the websites you visit every day without you noticing.

What proxies are actually used for

Proxies are commonly used to change your apparent location to reach geo-restricted content, to block or monitor access to specific sites in workplaces and schools, and to cache frequently requested data to speed up response times.

How a proxy differs from a VPN

The biggest difference is encryption scope. A VPN encrypts all of a device's internet traffic at the operating-system level inside a secure tunnel, while a proxy usually only relays traffic from a single browser or app and typically provides no encryption at all. In short, a proxy reroutes one app's traffic; a VPN encrypts and protects a device's entire connection.

The risk of using free proxies

A free proxy of unknown origin sits in a position to see your unencrypted data, including login credentials and payment details, exactly as it passes through. There have been real cases of free proxy operators intercepting traffic or injecting ads, so it is safer to avoid them for anything sensitive.

The limits of proxies with HTTPS

A proxy cannot read the actual encrypted content of an HTTPS connection (aside from the exception of a workplace intercepting traffic with its own installed certificate), but metadata like which domain you connected to and when can still be visible to whoever operates the proxy.

Want to go deeper on VPNs?

If you're curious how encrypting a device's entire traffic works, it is worth reading up on VPN basics as a next step.

Extra caution matters on public Wi-Fi

Combining an unverified proxy with an open public Wi-Fi network, like one at a café or airport, compounds the risk considerably. It is worth reviewing general public Wi-Fi safety practices as well.

Frequently Asked Questions

Does using a proxy make me completely anonymous?

No. A proxy only changes the IP address visible to the destination server — other identifying signals like your login accounts, cookies, and payment information remain exactly the same. The proxy operator can also potentially log which sites you visited.

Why do workplaces force employees to use a proxy?

Company proxies are typically used to restrict access to certain sites, log and manage employee internet usage, or filter out malicious incoming traffic for security purposes. In some setups, installing a company-issued certificate alongside the proxy even allows inspection of otherwise encrypted HTTPS traffic.