Anyone visiting a web page must be informed about what "cookies" are used for and be given the opportunity to refuse permission for such use.
A "cookie" is a small text file that contains information and is stored on your computer. Cookies are used purely for technical purposes to facilitate use of the web page. One type of cookie saves a file permanently on your computer. It may then be used to personalize a web page according to the user’s choices and interests.
The other type of cookie is called a "session cookie". While you are visiting a web page, cookies are sent between your computer and the server to access information. Session cookies disappear when you turn off your web browser. If you do not wish to accept cookies, your web browser can be set so that you automatically deny the storage of cookies or are informed every time a website requests to be allowed to store a cookie. Previously stored cookies can also be deleted through the web browser. Visit the web browser’s help pages for more information.