- They often appear below the organic search results
- They can help improve clickthrough rate
- They show additional information about a business
- They tend to improve an ad’s visibility
Explanation: Ad extensions often increase your total number of clicks by improving the clickthrough rate (CTR) of your ads. They provide valuable ways for users to learn more about your business or interact with your ad, such as making a phone call to your business or providing more links to your website.
Read more here: https://support.google.com/adwords/answer/2375499?hl=en