The information recorded in the Cookie is limited, and the Cookie is safe. It is impossible for a website to obtain your email address or other private information through cookies, and there is no way to access your computer through cookies.
Usage of Cookies: The server can use the arbitrariness of the information contained in cookies to filter and maintain these information regularly to judge the status in HTTP transmission. The most typical application of Cookies is to determine whether the registered user has logged in to the website, and the user may be prompted whether to keep the user information in order to simplify the login procedure when entering the website next time. These are the functions of Cookies. Another important application is processing such as "shopping cart". Users may choose different products on different pages of the same website for a period of time, and this information will be written into Cookies to extract information at the time of final payment.