Canonical URL management deals with duplicated content by presenting the correct version or the correct URL to the search engine. The first method is the Rel=Canonical tag. This tag is placed in the header of the duplicated pages and points to the actual or primary page.
Another method of directing the search engine to the correct or primary page or directory is through a redirect. A server redirect is like a change of address, which forwards the search engine and a browser to the correct URL.
Another application of canonicalization is the main URL. If the website uses the www prefix as part of the URL, make sure that the URL without the www prefix redirects (or moves people) to the www version. If both versions can be accessed, this can create a duplicate content problem.
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