Canonical URL is the preferred URL for search engine bots. For example: If you have two similar pages or their can be many versions of a page and Google bot will treat each page as a different page. Which can cause duplicate content issue and your site can be demoted in the search results for the same. In such cases, you have to tell to the bot that which one is preferred URL and you want Google bot to look into that page only. Proper canonicalization is very important for an eCommerce website.
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