01What cookies are
Cookies are small text files that a website saves in your browser when you visit it. They allow the site to "remember" information between requests — for example, that you are already logged in — since the HTTP protocol, on its own, does not retain that state.
Cookies can be session cookies (deleted when you close the browser) or persistent cookies (they remain for a defined period). They can also be first-party cookies (set by the domain you are visiting) or third-party cookies (set by another domain, usually for advertising and cross-site tracking). Similar technologies include localStorage, sessionStorage and tracking pixels.
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