In my opinion, this is the most important layer in the entire architecture, so I'll go into some detail on this. The first concept we’ll talk about is called Layered Architecture.. The Application layer is the appropriate place to put persistence interfaces because that is the layer of orchestration and coordination. The application layer is thin in terms of domain logic - it merely coordinates the domain layer objects to perform the actual work. The application layer may also contain additional implementations of domain interfaces, if the implementations provided by the infrastructure layer are not sufficient. That means not operating on the domain model from elsewhere. Domain-driven design (DDD) is the concept that the structure and language of software code (class names, class methods, class variables) should match the business domain.For example, if a software processes loan applications, it might have classes such as LoanApplication and Customer, and methods such as AcceptOffer and Withdraw. The Presentation Layer can only go through the Application Layer. Domain. Application Layer Organization . The use cases describe the features of the application, which may be independently deployed or deployed as a monolith. The Application Layer is the external point of access. DDD application service layer in a layered architecture which is the top, usually dealing with the front end (presentation layer) are application service layer. Now let’s zoom into the Bullsfirst OMS and discuss DDD as it relates to a single bounded context. The application layer contains the Use Cases for a particular subdomain in our application. DDD is a methodology whose main focus is on the Domain layer. Solution 2: checking validity in the application services layer Another way to implement this task is to check the incoming request in the application service and send the data to the entity only if it passes the validation. It is what defines the use cases on the domain model. Key points: In general, to create a full-fledged software application we will have to implement a lot more than just the domain model – user interface, database access and external service adapters are just a few examples. Browse "Domain-Driven Design Example" Repository On Github . That is, DDD does not impose any constraints regarding any other layer except for the Domain layer and Your question as well could be asked in the context of any other methodology. The domain layer is the heart of the software, and this is where the interesting stuff happens. 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