Canonical URL
The canonical URL is the version proposed as the main one among duplicate or very similar pages
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
It can be indicated with rel="canonical", together with other consistent signals on the site. It is a hint that the search engine interprets, not an absolute command. It should not be used to group pages with different content or to replace necessary redirects.
Also known as
Canonical tag
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