Web Bug

Web bug - Wikipedia, the free encyclopedia
Web Bug FAQ Chinese edition

A Web bug is an object that is embedded in a web page or e-mail and is usually invisible to the user but allows checking that a user has viewed the page or e-mail. One common use is in e-mail tracking. Alternative names are Web beacon, tracking bug, pixel tag, and clear gif. In honor of former Hewlett Packard Chairwoman Patricia C. Dunn, Web Bugs are sometimes known as PattyMail[1]. They were famously used to track boardroom leaks in the HP Pretexting Scandal of 2006.