Browser fingerprint

The various properties of your web browser or computer that a web site can notice when you visit. They may be slightly different from other browsers or computers, which can be a way to recognize you even if you didn't log in, even if your computer doesn't save cookies, and even if you connect to the Internet from a different network in the future. For example, you might be the only person who uses a particular site from a device set to a particular language, with a particular screen size, and using a particular web browser version; then the site could realize that it's you whenever you visit, even if you don't do anything to reveal your identity.