The canonical tag is also known as using the rel=canonical, or canonicalisation (canonicalization for the USA).
A canonical tag (aka “rel canonical”) is a way of telling an internet search engine that a specific URL stands for the master duplicate of a page. Making use of the canonical tag avoids troubles brought on by similar or “replicate” web content showing up on several links Virtually talking, the canonical tag tells internet search engine which version of a LINK you want to show up in search results page.
Cross-domain canonical URLs.
You may have the exact same piece of web content on numerous domain names. As an example, other websites on a regular basis republishes write-ups from Yoast.com (with specific permission). Look at every one of those write-ups, and you’ll see a rel=canonical web link point right back at our initial article.
This means all the links pointing at their version of the write-up count towards the position of our canonical version. They get to use our content to please their target market; we obtain a clear take advantage of it also. Everyone success.
Use the canonical tag is not required, as well as Matt Cutts has actually formerly specified that replicate material hardly ever causes a charge, unless it is spam or being made use of to manipulate ranking. Google primarily ignores the replicate web content to prevent having actually a SERP cluttered with the very same results from different Links, and if it does not the fine you could endure is a reduced total ranking for all duplicate material.