Why would an advertiser use sitelinks?
To let customers click a button to call the business
To showcase customer reviews with high-quality survey data
To show a link that sends people to the app store or starts downloading an app
To give customers quick access to multiple pages of an advertiser’s website
Sitelinks can take people to specific pages on your site—your store hours, a specific product, or more. Sitelinks will show in a variety of ways depending on device, position, and other factors. When your sitelink extension appears with one of your ads on a computer, it shows 2 to 6 links, which may appear on the same line or fill up to two lines of your ad.
Read more here: