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    Unless DDD has a really weird use for the term "use case", then they are not the same thing. Use case is a common term for a functional requirement of the app, whereas an application service is a piece of code that coordinates interactions between stuff like value objects, entities and domain services. Commented Feb 19, 2018 at 12:18
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    Alghough DDD and Uncle Bobs Clean Architecture focus on different things, if you are comparing the two, I'd say that application services in DDD roughly correspond to the application business rules layer in CA, which implements use cases (or user stories - at that level in the architecture, the distinction doesn't really matter). Also, the DDD terminology is trying to make a distinction between application services which depend on the domain layer, and domain services, which take part in implementing the domain logic. Commented Feb 19, 2018 at 12:52