Three language options in Bing Ads give you control over your advertising campaign and experience.
Your ad language setting determines the language you will use when you write your ads and should be the language of your customers.
Your ad language in combination with your location targeting determines who will see your ads. To learn more, see How does ad language and location targeting affect who can see my ads?
Your account language determines the language of your bills and the language of the email notifications and other account messages you receive.
Your product language determines the language of the Bing Ads interface.