The ports & adapters architecture is also known as hexagonal architecture, onion architecture, and clean architecture. All of these patterns are based on the same design principles, have the same components, and have the same relationships between them, but as in the case of the layered architecture, the terminology may differ:

• Application layer = service layer = use case layer

• Business logic layer = domain layer = core layer

Despite that, these patterns can be mistakenly treated as conceptually different. That’s just another example of the importance of a ubiquitous language.