A service area business (SAB) is a business that has no physical location which customers can visit. You typically specify your service area by city, postal code, or other areas (s).
Google writes:
The service area feature for businesses who visit or deliver to local customers. For example, it can be used by:
* A business that visits or delivers to customers, but doesn't serve customers at its business address (e.g. a plumber or cleaning service).
* A business that serves customers at its business address, but also visits or delivers to customers (e.g. a restaurant that also delivers food).