We often come across websites that are accessible by both the www and the non-www version of its URL. While apparently both the URLs look the same, the search engines can treat them as separate sites altogether. This is something known as a canonical issue.
"Canonicalization is the process of picking the best url when there are several choices, and it usually refers to home pages."
Matt further adds:
"For example, most people would consider these the same urls:
* www.example.com
* example.com/
* www.example.com/index.html
* example.com/home.asp
But technically all of these urls are different. A web server could return completely different content for all the urls above. When Google “canonicalizes” a url, we try to pick the url that seems like the best representative from that set.”
Since the search engines treat the www and the non-www version of the same URL to be different websites, there’s a risk of duplicate content issues arising because of the same content served on both the URLs.
Read More: http://www.searchenginejournal.com/canonicalization-seo-should-i-use-www-or-not/6950/
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