Canonicalization in SEO refers to the process of identifying and choosing the most authoritative version of a web page to be indexed by search engines. This is often necessary when a website has multiple pages with similar or identical content, as search engines may see these pages as duplicates and penalize the website for having low-quality content. By using canonicalization, website owners can tell search engines which page they consider to be the primary version, and ask that the other pages not be indexed. This helps to improve the website’s search engine rankings and ensure that search results are not diluted by multiple pages with similar content. Canonicalization is typically implemented using the rel=”canonical” link element in the HTML header of a web page.
So, basically, canonicalization is the web content that has more than one possible URL. Having multiple URLs for the same web content causes issues with duplicate content.
