Cookies are small text files a website asks your browser to store. They can keep you signed in, protect forms, remember a setting, or, on some websites, measure and track how you browse. Cookies can last only for the current browser session or remain until their expiry date or until you delete them.
This policy also covers similar technologies such as local storage. Local storage stays in your browser until the site removes it or you clear it; unlike a cookie, it is not automatically sent with every web request.