Hreflang
An HTML attribute telling Google which language/region a page targets.
What is Hreflang?
Hreflang is an HTML attribute that tells search engines which language and region a page is intended for, so the right version is served to the right audience. It is used on sites that publish the same content for multiple countries or languages to avoid duplicate-content confusion. Each language version references all the others, plus an x-default fallback for unmatched visitors.