A Canonical Link or Canonical URL is the address of a page that search engines will choose as the most relevant version of duplicate pages.

Adding the meta tag below to the <head> of a copy of a page, will tell search engines that the https://site.com/page.html address is the most relevant version.

<link rel="canonical" href="https://site.com/page.html">

Some services, like Medium, have a setting that can be used to include the Canonical URL.

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