What Private Browsing Actually Does (and Doesn't) Do

Most major web browsers offer a private or incognito browsing mode — Chrome calls it Incognito, Firefox calls it Private Window, and Safari calls it Private Browsing. The name makes it sound like no one can see what you are doing. The reality is more limited than that.

Here is what private browsing actually does: it prevents your browser from saving your browsing history, cookies, site data, and form entries on your device. When you close the private window, the browser deletes all of that information. Someone who picks up your phone or computer after you will not be able to see the sites you visited during that session.

That is genuinely useful in certain situations. If you are shopping for a surprise gift on a shared family computer, private mode prevents the gift from appearing in the browser's history or recommendations. If you want to see a website without being logged into any accounts (to see what it looks like to a new visitor, for example), private mode is helpful. If you use a public computer at a library, private mode helps make sure your accounts and history are cleared when you are done.

But here is what private browsing does not do: it does not hide your activity from your internet provider. Your ISP (like Comcast, Verizon, or AT&T) can still see which websites you connect to, even in incognito mode. Your employer or school can see your activity if you are on their network. The websites you visit can still see your IP address, which identifies your general location. And if you are signed into a Google or Facebook account in the private window, those companies are still tracking your activity on their sites.

Private browsing also does not protect you from malware or phishing attacks. If you enter your credit card number on a fake website in incognito mode, the damage is exactly the same as if you had done it in a regular window.

For true privacy from your ISP and the websites you visit, you need a VPN (Virtual Private Network). A VPN routes your traffic through an encrypted tunnel, hiding it from your internet provider and making it harder for websites to identify your location. Private browsing and a VPN serve different purposes and work well together.