Whenever you notice an ad on Google that has more information than a traditional search ad, that’s an ad extension. It might be an ad that has a phone number or links to more pages of a website. An ad extension is a feature that shows extra information about your business with your ad and gives searchers more reason to click. Some information your ad extension shows might be:
Your business address
Phone number
Customer ratings
Links to your website
Any other potential information that potential customers might like to know