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For a multilingual website is it better (in terms of income) to have an ad that serves each language or only one ad that serves all languages?
I know that Google adsense knows how to get the language of the page, and this question is not about that it's about the organisation of the ads. All ads are responsive.
Trying to rephrase the question, if I have one ad for all languages it will have more views does it make it more interesting for advertisers?
Google Adsense doesn't just get the language of the 'page', it gets the language preference of the visitor's browser. And of course, Google makes use of the visitor's browser history when serving ads.
So no, there's absolutely no need to use multiple ads for different languages.
You won't need multiple ads just to solve the audience that comes in. Because Google AdSense will deliver the ads identifying the behavior, geolocation and other preferences used by the user. The ads may or may not be in their favourite language depending up on their preferences.
Cut short Google will handle the multilingual ad part. You just need to give it a space to display.
