A plain-language definition of canonical URLs and why they matter for duplicate and preferred page paths.
Published | Updated
Short answer
A canonical URL is the preferred URL for a page when similar or duplicate versions exist. It helps search engines understand which version should represent the content.
Why it matters
Canonical signals help reduce confusion when the same content can be reached through more than one path. They do not replace good internal linking and consistent routing, but they do clarify preference.
How to verify
Inspect the page source for the canonical link element.
Check whether the canonical target matches the intended public URL.
Check whether internal links and sitemap entries reinforce the same preferred path.
Sources and notes
Google Search Central documentation is a primary reference for canonical behavior and duplicate URL handling.