Canonical is the element of the link tag that normalizes the URL, and is pronounced canonical or canonical.

By specifying Canonical, you can specify the page that you want to display preferentially in the search results among the contents with almost the same content (so-called duplicate content). Also as use methods other than the above, but you change the domain redirect If you can not be applied systematically, artificially to Google using the Canonical tag redirect you can be notified of the.

For example, if you change the domain from aaa.com to bbb.com, you generally redirect from aaa.com to bbb.com, but if you can not do that, Canonical to aaa.com URL of bbb.com By specifying, you can notify Google when redirected.

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