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A **canonical tag** is an HTML element that helps search engines understand the preferred version of a webpage. When you have multiple URLs with identical or very similar content, such as **ecommerce product pages** with different parameters that show the same product, a canonical tag tells search engines which version is the main, or canonical, one. This prevents issues like **duplicate content penalties** and ensures that **search engine rankings** are attributed to the correct page. Implementing **canonical URLs** is a key aspect of **technical SEO** for managing **content syndication** and maintaining a clean **site structure**.
