An application service is an externally visible unit of functionality, provided by one or more applications or components, and exposed through well-defined interfaces. A business service is a service offered by an organization to its customers that directly supports the work performed in a business process or function, exposed by an application-to-business interface.
Business and application services can be created in the following diagrams:
[application service only] Application architecture diagram (see Application Architecture Diagrams)
Service-oriented diagram (see Service-Oriented Diagrams)
City planning diagram (see City Planning Diagrams)