What is Canonical URL?

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.
 
A canonical tag is a way of telling search engines that a specific URL represents the unique copy of a page. Using the canonical tag prevents problems caused by identical or duplicate content appearing on multiple URL s. Basically, the canonical tag tells search engines which version of a URL you want to appear in Google search results.
 
A canonical URL is a your preferred URL. Still not making sense? We understand, so let us explain. URLs can have multiple variables and as such, to avoid issues like duplicate content, Google asks that the webmaster chooses one to use.
 
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