Annotations connecting equivalent pages intended for different languages or regions.
A practical example
Equivalent UK and UAE English pages can identify each other with en-GB and en-AE annotations.
What to watch for
Use supported language and optional region codes, reciprocal links and self-references. Hreflang does not translate content or guarantee that Google selects a particular URL.
Related reading
Explore Technical SEO and Site Map. Try our noindex checker for a practical next step. See how this fits into Technical SEO.