How it works
Browser fingerprinting combines details a website can observe, such as browser version, language, time zone, display size, fonts or supported media features. One detail is rarely unique; the combination may distinguish a browser across visits even when ordinary tracking cookies are blocked. It is a method of recognition, not proof that the site knows your real name.
A practical example
A site records a visitor's unusual language, screen size and installed-font pattern. Later, it sees a similar combination on another page. It may link the sessions probabilistically without placing a cookie. MDN's
fingerprinting glossary lists examples of observable characteristics.
What helps
Use a current browser with its built-in tracking protections. Avoid installing many exotic extensions or changing obscure browser settings just to look unique; unusual configurations can themselves stand out. Private browsing clears some local data after the session but does not promise anonymity. The right goal for most people is reducing unnecessary exposure, not achieving a provably invisible browser.
