Search ad extensions can drive direct action when users interact with your ads. It improves user experiences and increases engagement.
Ads are a part of the Google ecosystem and they have to be relevant to provide a good user experience and encourage users to take action. That’s why in order to respond to user behavior and demand ad extensions provide the right users with the right information at the right moment.
Ad extensions enrich text ad by showing extra information about the advertiser's business. Google Ads automatically serves the ad extensions that are predicted to have a positive impact on performance. At any given time, up to four extensions can show for a particular query or device.