What is mean by canonical tag

In SEO some important tag have in On- page optimization. On page optimization has vital role done in SEO. What is mean by canonical tag? How help in on-page optimization?

 

canonical tag solve the duplicate web query.

 

A canonical tag is a way of telling search engines that a specific URL represents the master copy of a page. Using the canonical tag prevents problems caused by identical or duplicate content appearing on multiple URLs.

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Understand it by example.

Suppose your have a page with products list. page name product.html
There is a option to view products according to added date, and when user click on this then open another page productbyday.html
So, because products and contents are same only its rearrange according to order so will use canonical tag at productbyday.html of product.html ...... Its means information is same and main page is product.html.

 

In the Canonicaltag you can redirect your Url to another URL. But Google does not give it much priority. It should be avoided if possible.