In a nutshell, AdWords ad extensions add additional information to your ads.
Normal text ads include your headlines, and a short description and URL. Extensions allow advertisers to include more useful information like contact information reviews and ratings, etc.
Let us go through different type of extensions:
1. Sitelink Extensions
These extensions are additional links you can add that direct customers to a specific page of your site.
2. Call Extensions
An extension is the best way to include a contact number in your ad; keeping a phone number in ad text is against Google policy and will result in the ad being disapproved.
Call extension is one extension where scheduling is particularly important. Customers’ need to schedule the extension to only show during business hours when someone is able to answer the phone.
3. Message Extensions
Same like call extensions, these message extensions allow people to contact your business directly via text message. AdWords may do this automatically if they deem it one of your business goals.
4. Structured Snippet Extensions
Snippet extensions are used to highlight specifics about your product or service. Such type of extensions are non-clickable snippets that show at the bottom of your ad with a header and list of features.
Structured Snippet Extensions will help promote any unique or important details about your business.
5. Price Extensions
Theses show a list of your products or services with their prices by allowing customers to browse your catalog without visiting your site to do so.
6. Review Extensions
You can add in reviews of your product or service from third-party sites With review extensions.
Image Credit: Google AdWords Blog
7. App Extension
It allows you to link an ad to your app download.
It will appear below your text ad and direct people directly to your app download.The download link is compatible with both Android and iOS – though only will appear at a time. The search engine will detect which store to use based on the user’s device.
8. Automatic Extensions
The name itself tells that extensions of this type are added automatically by AdWords unless you choose not to have them do so, these are additional links included at the bottom of our text ad.