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What is the canonical issues in SEO

What is a canonical in SEO   ?

Ans: The rel=canonical element, often called the “canonical link”, is an HTML element that helps webmasters prevent duplicate content issues. It does this by specifying the “canonical URL”, the “preferred” version of a web page. Using it well improves a site's SEO.

What is   the   canonical  issues  in SEO ?

A canonical issue arises when 301 redirects are not properly in place. This means that your website can be accessed by search engines from several different URLs. This means that search engines can then potentially index your site under different URLs, meaning that it will look like a site of duplicated content.

For example’s sake, these are their URLs:

         http://example.com/wordpress/seo-plugin/

         http://example.com/wordpress/plugins/seo/

This is what rel=canonical was invented for.

 Especially in a lot of e-commerce systems, this (unfortunately) happens fairly often. A product has several different URLs depending on how you got there. You would apply rel=canonical as follows:

1.        You pick one of your two pages as the canonical version. It should be the version you think is the most important one. If you don’t care, pick the one with the most links or visitors. If all of that’s equal: flip a coin. You need to choose.

2.        Add a rel=canonical link from the non-canonical page to the canonical one. So if we picked the shortest URL as our canonical URL, the other URL would link to the shortest URL like so in the <head> section of the page:
3. <link rel="canonical" href="http://example.com/wordpress/seo-plugin/">

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