Technical Definition
Hidden text is content invisible to users but readable by search engines. Methods: white text on white background, CSS positioning off-screen, zero font size, behind images. Spam tactic violating guidelines. Note: genuinely hidden content (accordions, tabs) is different and generally acceptable if accessible.
Simple Explanation (ELI13)
Hidden text is sneakily putting keywords where users can't see them but Google can, like white text on a white background. It's an old spam trick that will get you penalized. It's different from using accordions or tabs where content is hidden until clicked, which is generally okay.
Related Terms
Black Hat SEO, Spam, Manual Action, Guidelines
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