A variety of information can be stored in a cookie file. Some organizations use cookies to track your every move on their site, others store user identification and passwords in order to save repeat visitors having to fill out form information each time they visit. However other organizations may use cookies to profile user habits and browsing habits and that information can then be passed on to others for advertising purposes.
How To Delete Cookie files:
Internet Explorer:
Start Internet Explorer.
NOTE: If using an older version of Internet Explorer then you will need to manually delete the cookies from your hard drive as follows:
Firefox: