Not every ad extension is appropriate for every advertiser. Shopping extensions, for example, can only be used to showcase products on ecommerce websites while App extensions are only appropriate for businesses who have a mobile app they want to sell or promote.

However, there are four ad extensions that are appropriate for most businesses and should absolutely be leveraged to add more information to your ads and expand the ad’s overall size. They are:

1. Sitelinks

The original ad extension, sitelinks are a powerful way to add more links to your ads. Each sitelink can contain up to 25 characters in the link text plus a two-line description totaling 140 characters per link. As with most ad extensions, Google selects which sitelinks and how many will appear with each ad and will show two to six sitelinks per ad.

2. Callout extensions

Callouts are short snippets of text that can be up to 25 characters. They can be used to highlight business selling points and features (for example, “Open 24 Hours”). They appear directly beneath the ad description and above the sitelinks.

Google shows two to six callout extensions per ad, though the specific number of callouts varies based on what Google feels are the most relevant (and likely to get clicked on) callouts.

3. Call extensions

Call extensions allow advertisers to append a phone number to an ad without including it in the body of the ad text (in fact, your ad may get rejected if you try to include a phone number directly in the body of the ad). Phone numbers using call extensions are clickable on mobile devices, allowing users to tap on a phone icon to call the business directly

4. Structured snippets

A structured snippet is basically a list of products, services, or other elements that help define a company’s offerings more clearly to consumers. There are thirteen different types of structured snippets, some of which are only appropriate for specific businesses. For example, “neighborhoods” for local businesses or real estate, and “degree programs” for schools.