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.
Doe’s it matter in websites google ranking?
Duplicate content is a complicated subject, but when search engines crawl many URL s with identical or similar content, it can cause a number of SEO problems. First of all, if search crawlers/robots have to wade through too much duplicate content, they may miss some of your unique content. Second, large-scale duplication may reduce your ranking ability. Finally, even if your content does rank, search engines may pick the wrong URL as the*****original. Using canonicalization helps you control your duplicate content.
The problems with URL s in 2018
You might be thinking that canonicalization nothing that you have to worry about. The problem is that humans, tend to understand a page as a concept, such as your homepage & For search engines, every unique URL is a separate page.
For a human, all of these URL s represent a single page. To a search crawler/ Robots, every single one of these URL s is a unique*****page. Even in this example, we can see there are 4 copies of the homepage. In reality, though, this is just a small sample
of the variations you might encounter.
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