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Alternate hreflang tag
Introduced by Google in December 2011, the hreflang attribute allows you to show search engines what the relationship is between web pages in alternate languages.
Many websites serve users from around the world with content translated or targeted to users in a certain region. Google uses the rel="alternate" hreflang="x" attributes to serve the correct language or regional URL in Search results.
The SEO Module Url will add hreflang automatically where it is required. So you do not need to do anything.
The hreflang looks like this:
< link rel="alternate" href="example.com" hreflang="es-es" >
And is placed in the head tag of the html page.
Since SEO Module Url support multilanguage urls, they will have the separate hreflang tags according to the page language.