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Canonical URL
The preferred version of a webpage when duplicate or similar versions exist.
What is Canonical URL?
When the same content is accessible at multiple URLs (with/without www, with tracking parameters, print versions), the canonical tag tells search engines which version to index and rank. This prevents duplicate content issues and consolidates ranking signals to the preferred URL.
Example
If your product page exists at both '/product?color=red' and '/products/red-widget', a canonical tag would tell Google to only index '/products/red-widget'.