Canonical tag is used to detect duplicate sites on search engines. this tag is part of the HTML head of a web page.

A canonical tag specifies the source URL (or original content page) of a given page to a search engine such as Google. Canonical tags are used to declare a single page as its own source or for duplicate pages to reference their source / originating page. Search Engines use the canonical tag to combat duplicate content issues and assign search engine ranking value for that content to the page designated as the “source” URL.

The canonical tag it specifies the source url of a given page to search engine such has google it declare single page as its own source search engine use canonical tag reduce the duplicate content assign page ranking for the content.

The basic purpose of canonical tagging is simply to keep duplicate content out of the search engine index while consolidating preferred page’s strength.

A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical" or "preferred" version of a web page as part of search engine optimization.

Canonical tag is used to tell google which of my page is he main content of the website.This will avoid duplicate pages of the website.

Canonical tags are used to declare a single page as its own source or for duplicate pages to reference their source / originating page. Search Engines use the canonical tag to combat duplicate content issues and assign the search engine ranking value for that content to the page designated as the “source” URL.

Canonical element called the canonical link is an HTML element that helps webmaster prevent duplicate content issue. It does this by specifying the canonical or preffered version of a webpage.

A Canonical tag specifies the source URL of a given page to a search engine such as Google.Canonical tag are use to declare a single page as its own source or for duplicate pages to reference their originating page.

Canonical tag identifies the source URL of particular page to a search engine such as Google. It is used to declare a single page as its personal basis or duplicate page to reference their source page.

I guess, you have got clear idea on what canonical tag is about.
If you assume there are two pages with same content, you can add a canonical tag to the original source and can redirect another website to the original one.

A canonical tag is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical" or "preferred" version of a web page as part of search engine optimization.

A canonical link element is an HTML element that helps webmasters prevent duplicate content issues by specifying the "canonical" or "preferred" version of a web page as part of search engine optimization.
http://www.projuktishop.com/

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A canonical tag is a way of telling search engines that a specific URL represents the master copy of a page.