web bug is an object that is embedded in a web page or email and is usually invisible to the user but allows checking that a user has viewed the page or email. Common uses are email tracking and page tagging for web analytics. Alternative names are web beacontracking bugtag, or page tag. Common names for web bugs implemented through an embedded image include tracking pixelpixel tag1×1 gif, and clear gif. When implemented using JavaScript, they may be called JavaScript tags.

Web bugging is analogous to conventional bugging, but is not as invasive or intrusive. The term should not be confused with the more benign web spider nor more malicious computer worms.

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