Canonical URL

A specific URL that is preferred by search engines when showing some content from your website. When a user can reach a page via multiple channels (using the search function or going through your categories), there are many possible layouts for the link, such as http://www.website.com/product.php?color=red. The canonical URL allows for a clearer link, such as http://www.website.com/specific_page

You can set the canonical URL for a page by using the <link> tag inside the <head> section of your website:

<link rel="canonical" href="http://www.website.com/product.php?color=red" />