What is a canonical tag?

 A canonical tag, also known as a rel=canonical tag, is an HTML element that is used in website development and search engine optimization (SEO). It is placed in the head section of a webpage to indicate the preferred or canonical version of that page when there are multiple versions of the same content accessible through different URLs.


The purpose of a canonical tag is to address duplicate content issues that may arise when similar or identical content is available on multiple URLs. This can occur due to various reasons, such as URL variations, sorting parameters, or content syndication.

By specifying the canonical tag on a webpage, you are essentially telling search engines which version of the content you want to be considered the authoritative or primary version. This helps search engines understand the preferred URL to index and display in search results, consolidating the ranking signals and avoiding dilution of SEO efforts across duplicate pages.

For example, if you have a product page with multiple URLs like:

  • example.com/product-page
  • example.com/category/product-page
  • example.com/product-page?source=ad

You can add a canonical tag to the preferred URL (e.g., example.com/product-page) to indicate that it is the canonical version of the page. This way, search engines will understand that the other URLs are duplicates or variations and should be consolidated under the preferred URL for indexing and ranking purposes.

Implementing canonical tags correctly can help improve SEO by consolidating link equity, avoiding duplicate content penalties, and ensuring that search engines understand your preferred version of a page.

Here is the examples of backlinks:

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