What it means
The website serves the same answer at several addresses even though each copy provides no independent value.
Term in plain language
Duplicate page
A separate URL whose content fully or substantially matches another page.
Why it matters
Duplicates consume crawl activity, complicate primary-page selection and can split links and other signals across URLs.
Example
A category with an empty sort parameter repeats the clean category and should be consolidated with a redirect or canonical.
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