What is the main role of Canonical tag in SEO?

What is Canonicalization?

Canonicalization can be a challenging concept to understand (and hard to pronounce: "ca-non-ick-cull-eye-zay-shun"), but it's essential to creating an optimized website. The fundamental problems that canonicalization can fix stem from multiple uses for a single piece of writing–a paragraph or, more often, an entire page of content–that appears in multiple locations on one website or on multiple websites. For search engines, this presents a conundrum: Which version of this content should they show to searchers? SEOs refer to this issue as duplicate content

To provide the best user experience, search engines will rarely show multiple, duplicate pieces of content and thus, are forced to choose which version is most likely to be the original (or best).
 
Canonical tag is an attribute in the HTML code; it allows administrators to prevent duplicate website content through the identification tag or card canonical preferred.

In the field of SEO, the canonical tag helps Google know the article on your website is not copy, and it should be found in search results website.

This card must be inserted at the beginning of the URL, and when you use this card you should consider because it appears more cards on your website, it will cause not a good thing for Google sites being underestimated.

But in case you do not have to deal with star with the same article, you use this card to make sure you do not get fined by Google duplicate content errors on the page
 
The canonical tag is a new tag proposed by Google, designed to minimize crawl errors and the indexing of duplicate content in your website. Support for the tag has been adopted by most of the search engines, and it’s a good idea to add to your own website if you want to get your best search engine rankings.
 
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