: The business rules can be tested without the UI, Database, Web Server, or any other external element.
A typical Clean Architecture implementation is visualized as concentric circles: DEV Community Responsibility Components Critical Business Rules Objects that encapsulate enterprise-wide business rules. Application Business Rules Orchestrates the flow of data to and from entities. Interface Adapters Data Conversion
The book by Robert C. Martin provides a disciplined approach to software design, focusing on creating systems that are easy to maintain, scale, and test. You can find various editions of the book through the following sources:
The UI can change easily without changing the rest of the system.