SEO
Canonical Tag
An HTML tag that tells search engines which version of a page is the original.
A canonical tag (rel='canonical') tells search engines which version of a page is the preferred original when duplicate or similar content exists across multiple URLs. Critical for e-commerce sites (filter URLs, color variants), syndicated content, and multi-domain setups.
Example
An e-commerce product is available at /shoes/red-nikes and /shoes/red-nikes?utm_source=email. The canonical tag on both points to the clean URL, preventing duplicate content issues.
Related terms
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