web bug (plural web bugs)
- (Internet, marketing) A small, usually transparent image added by an advertiser to a webpage (to track its popularity) or email message (to track when it is read).
- Synonyms: tag, tracking bug, tracking pixel, page tag, pixel tag, web beacon, web tag
2002, John R. Levine, Ray Everett-Church, Greg Stebben, Internet Privacy For Dummies, Wiley, →ISBN:When a Web bug is programmed into a Web page, its code looks similar to the code for just about any graphic image appearing on that page.
2011, Andrew McStay, The Mood of Information: A Critique of Online Behavioural Advertising, Bloomsbury, →ISBN:Google had a web bug on 92 of the top 100 sites, and on 88 per cent of the total domains reported in the data set of almost 400,000 unique domains.
Further reading
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web beacon on Wikipedia.Wikipedia 