Glossary
Canonical URL
The preferred version of a webpage when multiple pages have similar content. It tells search engines which version to show in search results to avoid duplicate content issues.
A canonical URL works like the "official" address for a webpage when multiple versions of the same or very similar content exist. For example, a product might be accessible through several URLs: from different categories, with tracking parameters, or with slight variations. By specifying a canonical URL, you tell search engines which version should be considered the main one. Canonical tags help solve duplicate content problems, which occur when search engines see multiple pages with the same content and don't know which to rank. Without clear guidance, search engines might split ranking signals between these pages, reducing their overall visibility. The canonical tag looks like <link rel="canonical" href="https://example.com/preferred-page" /> and goes in the HTML head section. You should use canonical tags when you have product pages accessible from multiple categories, printable versions of pages, mobile and desktop versions, or when using tracking parameters in URLs. Setting canonical URLs correctly helps concentrate ranking power on your preferred page, improves crawl efficiency by preventing search engines from wasting time on duplicate pages, and ensures the right version appears in search results.