Can you explain the principle of operation of intermediate layers in system architecture?

Intermediate layers in a system architecture serve to separate responsibilities and simplify code maintenance. They act as intermediaries between different components, such as between the user interface and business logic or between business logic and data access.

Main functions of intermediate layers:

• Abstracting complex logic and providing a simple interface for upper layers.
• Ensuring code reusability.
• Simplifying testing and debugging.
• Increasing system flexibility and scalability.

For example, in a C# application, the service layer can handle business logic, while the repository layer interacts with the database. This approach helps isolate changes and improves the project structure.