input: [Format] Ad extensions [Description] Extends your ads with more information, such as additional links to your website, store address, or phone number. These formats usually appear only across the Search Network. However, location extensions and call extensions may also appear across the Google Display Network. Amherst Ice Cream Parlour Ad www.example.com (413) 123-4567 Our specialty is pistachio. English majors, buy 1 get 1 free. 100 Dardanelles Rd, Amherst MA [Main benefits] 
output: Provide additional details and contact information that can make your ads more relevant to customers. You can opt to extend your ad for mobile devices differently than how you extend your ad for tablets and computers.