Glossary

Canonical URL

A canonical URL is the one address a page tells search engines to index when the same content can be reached at several URLs.

Also called

rel=canonical

A page declares it with <link rel="canonical">. Sorting, filtering and tracking parameters create duplicate URLs; pointing them all at one canonical keeps a site from competing with itself.

Related terms

Meta descriptionA meta description is a one- or two-sentence summary of a page in its HTML. Search engines often show it under the title in results.
Title tagThe title tag is a page's <title> — the clickable headline in search results. Google shows about 50–60 characters of it.
Thin contentThin content is a page with too little original substance to be useful — a near-empty list, a stub, a duplicate — which search engines rank poorly.

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