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What is Canonical URL?

An HTML element that tells search engines which URL is the preferred version of a page when duplicate or similar content exists at multiple URLs.

The canonical tag (link rel="canonical" href="...") consolidates SEO signals when the same content is accessible via multiple URLs. Common scenarios include HTTP vs HTTPS, www vs non-www, trailing slashes, URL parameters (sorting, pagination, tracking), and syndicated content. Without canonical tags, search engines may split ranking signals across duplicates or choose the wrong version to index. Self-referencing canonicals (pointing to the current URL) are best practice for all pages. Canonical URLs should be absolute (not relative), consistent with the sitemap, and match the URL returned by redirects. They are a hint, not a directive — search engines may override them.

Related Terms

Caching
Storing copies of frequently accessed data in faster storage to reduce load times and server processing.
HATEOAS
Hypermedia As The Engine Of Application State — a REST constraint where API responses include links to related actions and resources.
CORS Headers
HTTP headers that control cross-origin resource sharing between different domains, specifying allowed origins, methods, and headers.
Idempotency
A property where performing an operation multiple times produces the same result as performing it once.
Web Components
A set of browser-native APIs for creating reusable, encapsulated custom HTML elements with their own styling and behavior.
API Rate Limiting
A strategy for limiting the number of API requests a client can make within a specified time window to protect server resources.
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