--- type: Glossary Term title: "hreflang" description: "A signal that tells search engines which language and region version of a page to serve." resource: "https://prerendering.com/glossary/hreflang" tags: [standards, glossary] timestamp: 2026-05-11T00:00:00Z --- # hreflang A signal that tells search engines which language and region version of a page to serve. A annotation that maps each page variant to its language-region pair (e.g., en-US, fr-CA, x-default). Misconfigured hreflang creates wrong-locale rankings and can trigger duplicate-content treatment across markets. Bidirectional consistency matters: if A links to B, B must link back to A. ## Related - [International SEO and Hreflang for Modern Frameworks](/blog/international-seo-and-hreflang-for-modern-frameworks.md)