A canonical tag tells the crawlers van Google What is the primary URL page. This allows search engine which page should be indexed. A canonical tag is also called a canonical URL named.
A canonical tag is used to duplicate content to counter. Sometimes multiple pages contain similar content, This happens, for example, when different URLs exist for different devices or when another website has copied your web text. When you add a canonical tag to the original or main page, this page will be indexed and shown (higher) in the search results from Google.
So the primary page contains a canonical tag that points to the primary page itself, while the pages with similar content contain a canonical tag pointing to the primary page.
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