Cookie

A Cookie is a text file that a Web site can place on a site visitor's computer such that information can be read later. Cookies are used by Web sites to help the Web site remember the visitor on subsequent visits.

Cookies are a standard Internet technology and cannot provide any information to the site owner that was not known by the Web site at the time the cookie was written.

For more information on cookies, click below:
http://www.webopedia.com/TERM/c/cookie.html