teaser ad
From Longman Dictionary of Contemporary Englishteaser adˈteaser ad noun [countable] an advertisement that is used to make people interested in a product, but that does not give very much information about the product, so that people will pay attention to more advertisements laterFrom Longman Business Dictionaryteaser adˈteaser adMARKETING an advertisement that is used to get the public interested by giving very little information about the product. The purpose is to get attention for the full ADVERTISING CAMPAIGN that follows → ad