A cookie is a file that a website you visited saves to your computer's hard drive. When you return to the website later, it will be able to look at that file and recall what you had previously entered. The cookie often contains data such as your user name, the goods you looked at, and the settings you selected on the website. Some people want to deactivate cookies for all websites or only those they don't trust. .Cookies are beneficial because they help websites remember and monitor users without the need for a large database or server. Cookies are harmful because they could include information about you that you don't want other websites or hackers to know. Some people want to deactivate cookies for all websites or only those they don't trust. Additionally, it's not a terrible idea to occasionally erase all of your cookies or allow your firewall or anti-virus software wipe them up. A Stateless Protocol is what the web's primary language, HTML, is. Simply put, this basically implies that no data is kept between page loads. If cookies didn't exist, it would be difficult to continue to be logged in to a website. When you log in to a website (or even just visit, depending on the data they gather), a cookie is sent to your computer and kept there. All subsequent queries to that website made by your browser will include that cookie. The website recognizes you even if you are still on the other side of the connection thanks to the cookie value. Cookies are what allow the website to recognize you, and they may also be used to store and transmit information back to the website.