Marketing & measurement
Pixel
In advertising, a tracking implementation used to collect eligible website events; in images, a small picture element.
In everyday use
A marketer checks whether a purchase event is recorded by the site's pixel.
What to keep in mind
Event accuracy, consent and privacy requirements matter; the word has more than one technical meaning.
Also searched as: tracking pixel, Meta pixel
Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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