What is Canonical tag in SEO?

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.
 
A canonical tag specifies the source URL (or original content page) of a given page to a search engine such as Google. Canonical tags are used to declare a single page as its own source or for duplicate pages to reference their source / originating page.
 
When the different URL’s have the same Contents on the Website, The Search engine will consider that It’s a “ Duplicate Content ” issue. So There is a way to solve this in SEO through the Canonical tag.
 
The canonical tag is an important tag used in SEO optimization to avoid possible content duplication between two pages published with content similarity. If the same content portion is published with more than 1 URL it may cause content duplication. To avoid the problems of content duplication canonical tags are used.
 
The rel=canonical element, often called the “canonical link”, is an HTML element that helps webmasters prevent duplicate content issues. It does this by specifying the “canonical URL”, the “preferred” version of a web page – the original source, even. Using it well improves a site's SEO.
 
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