Technical Definition
A canonical tag (rel='canonical') is an HTML element that specifies the preferred URL when duplicate or similar content exists at multiple URLs. It consolidates ranking signals to the canonical URL. Self-referencing canonicals are best practice. Google treats canonicals as hints, not directives, and may choose a different canonical based on other signals.
Simple Explanation (ELI13)
A canonical tag tells Google which version of a page is the 'main' one when you have similar content at different URLs. For example, if your page works with and without 'www', the canonical tag says 'this is the official version.' It prevents Google from getting confused by duplicate content.
Related Terms
Duplicate Content, URL Parameters, Consolidation
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