A single-pixel GIF file set to a transparent status and thus invisible. Also known as a "transparent GIF," "1-by-1 GIF" and "clear GIF," it is is used as a tracking mechanism for Web pages to monitor a user's activity. See Web bug and GIF.
"invisible GIF." YourDictionary, n.d. Web. 23 October 2018. <https://www.yourdictionary.com/invisible-gif>.
invisible GIF. (n.d.). Retrieved October 23rd, 2018, from https://www.yourdictionary.com/invisible-gif
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