Web Bugs
•A Web bug is a small, hidden graphic on a Web page or in an e-mail message that is designed to work in conjunction with a cookie to obtain information about the person viewing the page or e-mail message and to send the information to a third party.
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•When the user loads the Web page that contains this code, the browser downloads the hidden graphic.  This process can identify your IP address, the Web site you last visited, and other information about your use of the site in which the clear GIF file has been embedded and record it in the cookie file.