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Definition and usage of Canonical URL tag.

What is a Canonical URL?

Canonical URL tag identifies the source URL or the original content page of a particular page (having multiple URLs) to search engines.

www.example.com

example.com

www.example.com/index.html

example.com/home.asp

http://www.example.com

https://www.example.com

From a search engine perspective all the above URLs are all different URLs. And for the above site the canonical URL Tag looks like is,

<link rel=”canonical” href=”http://www.example.com/Sample+page” />

Usage of Canonical URL:

Search engines don’t like duplicate content at all. So, having similar or identical pages on your website can be a reason for ranking devaluation by the search engines. Therefore, by properly using canonical tags to pages on your site, you can avoid this problem.