Definition
Hreflang annotations connect alternate language or country versions so German users get German pages and US users get US ones. Implemented wrong, it suppresses the right pages; implemented right, it multiplies international reach without duplicating effort.
Why it matters
For any brand selling across borders, hreflang hygiene is the difference between international expansion and international cannibalization.
Benchmarks
Every annotation set should be bidirectional - errors here void the cluster
All glossary terms