WHAT ARE COOKIES?
Cookies are text files containing small amount of information that the browser memorizes on the computer or on any device when a website is visited by a user. If the website is consulted a second time, it is able to read the information memorized through the cookies, and so, personalizes the user's visit. Cookies are not used to determine the visitor's personal identity, nor to collect information memorized on the computer or from the user's files.
To learn more about cookies, please visit http://www.allaboutcookies.org/
Session cookies: are temporary, and only last until the browser is open.
Persistent cookies: remain on the hard disk or device until their expiry or cancellation by the user.
HOW TO CONTROL AND DELETE COOKIES
Should you wish not to receive a cookie from the website, you must set up your browser so that you are notified when you receive a cookie. By doing that, you can decide whether to accept it or not.
To find out more about cookie management and how to deactivate them, visit http://www.allaboutcookies.org/manage-cookies/.
In any case, please consider the fact that if you deactivate cookies in your browser, you won't be able to take complete advantage of all the website's functions, such as automatic connection and other customized functions.
Wikipedia info about cookies: https://en.wikipedia.org/wiki/HTTP_cookie