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canonical URL
September 11, 2015
Canonical URL stands for <link> element with rel = “canonical” attribute, that allows to avoid double indexing issue in case some of your content is available via a few different links. This rule is recognized by search engines like Google, Yahoo and Line/MSN, and makes them accept site pages at “main” link and “canonical” links to it. E. g., this makes search engines index pages http://www.example.com and http://www.example.com as same page with unique content instead of duplicates. Simply include this <link> element to the <head> section of your pages and robots won’t follow duplicated pages, for example, if this is same item, included to a few site categories.
Feel free to check the following link for more details: Use canonical URLs.