Front-End Development Trends in 2025: What Every Developer Should Know
27 August 2025
The Core Layers of Clean Architecture Explained
At the heart of Clean Architecture are four distinct layers:
1. Entities (Enterprise Business Rules)
- Pure domain models.
- Example: User, Order, Invoice.
- Independent of frameworks.
2. Use Cases (Application Business Rules)
- Encapsulate workflows and application logic.
- Example: PlaceOrderUseCase, RegisterUserUseCase.
- Defines what the app does.
3. Interface Adapters
- Translates data between use cases and external systems.
- Example: Controllers, Repositories, Presenters.
- Shields business logic from technical details.
4. Frameworks & Drivers
- External tools like databases, UI, APIs.
- Example: React, SQL, Firebase.
- Can be replaced without affecting core.
The Dependency Rule:
“Dependencies can only point inward.”
Meaning → outer layers depend on inner layers, but not vice versa.
