(also Tags or Beacons) 1×1 pixel tags on websites that track users’ locations and activities online, such as a registration or conversion. Some are powerful enough to know what a user types on a particular site. A pixel is a way to track user data. Originally, all pixels were literally snippets of code that called for a 1X1 transparent pixel to be delivered to a webpage by a third-party server. Nowadays, pixels may either be literal pixels or be javascript based. When the pixel loads, the third-party server can record information such as the IP address of the user’s computer, URL of the page, and time the page was viewed.
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