AI SEO Glossary
What is Canonical URL?
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TL;DR — A canonical URL is the single, authoritative address a site declares for a piece of content, so search engines consolidate ranking signals from duplicate or near-duplicate URLs onto one page. Declared with a rel="canonical" link element, it answers the question every catalog raises: when filters, sort orders, tracking parameters, and pagination create dozens of URLs for the same content, which one should be indexed? Canonicals are a hint, not a directive — engines honor them when the declared page genuinely represents the duplicates.
Definition & scope
eCommerce is where canonicals earn their keep: faceted navigation can mint thousands of URL permutations per category. A disciplined canonical strategy keeps the indexed set clean, concentrates authority, and protects crawl budget.
Canonicals also matter during migrations and redesigns — carrying forward the canonical structure (or 301-redirecting into it) is a large part of why a replatform does or doesn't preserve organic traffic.
Related terms
- Crawl Budget — canonicals stop duplicate URLs from consuming it.
- Programmatic SEO — template-generated pages need deliberate canonical rules.
Related services
- eCommerce SEO Audit — canonical and duplicate-content review.
- Migration SEO Methodology — preserving canonical equity through a replatform.
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