A canonical tag, which appears as , allows search engines to identify the primary version of a page when there are similar pages with the same content. Thus, this is important for duplicate content issues, which might harm SEO rankings. For example, e-commerce sites have several URLs for accessing the same product page, so a canonical tag would help combine link equity and ranking signals to a primary page. The appropriate implementation of canonical tag ensures that search engines would prioritise those contents in search-results concerning site authority and visibility improvement.