What is Canonical URL
Canonical is a html tag used to indicate preferred URL of a webpage, suppose you want "example.com/journal" to be the preferred URL, even though a variety of URLs can access this content. Canonical tag will hep your webpage from content copy issues if it is accessible to two or more URLs. A common structure of canonical tag is like "<link rel='canonical' href='preferred URL' />". Presence of canonical may give a slight change to your SERP.
Important things about Canonical
- Canonical is a best practice to handle your naked domain.
- Canonical support announced by Google, Yahoo and Microsoft in February 2009.
- Canonical should be inserted into part of a webpage.
- Using 301 redirection along with canonical is the best way to deal multiple URLs.
- There may be unknown URLs that can access your website, like "example.com" and "example.com/index.html".
Journals About Canonical