Canonical URL

Overview

Canonical URL tag is a page level meta tag that helps site owners rid self-created duplicate content by specifying the version of a URL that is considered the most relevant and telling search engines which duplicate content to keep out.


How it Works

Let’s say our preferred URL for the BFM blog is: http://www.bluefountainmedia.com/blog/

Problem

But because of parameters or session ids we have 2 pages with duplicate content on different URLs: http://www.bluefountainmedia.com/blog/?ref=609

Solution

To fix this problem simply add a <link> tag with the preferred URL version inside the section of the duplicate content page:

<link rel=”canonical” href=”http://www.bluefountainmedia.com/blog/” />

Rand Fishkin Explains Canonical Tags


Canonical URL Resources

Search Engine Watch
SEOMoz
Search Engine Land

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