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A canonical tag, often written as `rel=canonical`, is a vital HTML element used by SEOs to prevent duplicate content issues on websites. This tag tells search engines like Google which version of a page is the preferred or canonical version, consolidating ranking signals for similar pages. For example, if you have the same product listed under `/products/red-shirt` and `/clothing/t-shirts/red-shirt`, a canonical tag on the latter can point to the former, ensuring search engines understand `/products/red-shirt` is the primary page to index and rank. Implementing a canonical tag properly helps improve search engine optimization by avoiding penalties for duplicate content and focusing link equity onto the designated canonical URL.
